Driving along Michigan Avenue in the northeast quadrant of Washington, D.C., past the brick halls of The Catholic University of America, visitors first spot a great dome clad in blue, gold, and red tile rising above the trees, flanked by a slender square campanile. Closer up, the bright limestone mass opens with a monumental recessed archway across the main facade, built without a single structural steel beam inside.
Vietnamese Catholics often call this sanctuary the Basilica of the Immaculate Conception in Washington, its full name being the Basilica of the National Shrine of the Immaculate Conception. According to Shrine documentation, it is the largest Roman Catholic church in North America, dedicated to the Blessed Virgin Mary under her title of the Immaculate Conception, patroness of the United States. Within the Vietnamese diaspora, the basilica is especially cherished for the Our Lady of La Vang Chapel, gifted by Vietnamese-American Catholics in 2006.
IThe Title of the Immaculate Conception and a National Shrine
The name of this sanctuary carries three layers. Basilica is an honorary title granted by the Holy See to churches of special liturgical and historical weight, conferred here as a minor basilica on October 12, 1990. National Shrine signifies a sacred pilgrimage church for Catholics across the entire country rather than a local parish church, which is why Shrine publications call the building America's Catholic Church. The third layer is the title of the Immaculate Conception, under which Catholic bishops of the United States venerate Mary as patroness of the nation. More than eighty chapels and oratories inside honor the Virgin Mary under titles brought by immigrant communities from around the world.
In Roman Catholic doctrine, the Immaculate Conception means that the Virgin Mary, from the very first instant of her conception in her mother's womb, was preserved free from original sin by the grace of God because she was chosen to be the Mother of Jesus. The Catholic Church solemnly defined this teaching as dogma in 1854, celebrating its feast on December 8. The dogma refers to the conception of Mary herself in the womb of Saint Anne, not to the virginal conception of Jesus, a distinction often confused by newcomers.
According to Shrine archives, the idea of building a great Catholic church in the national capital was mentioned as early as 1846, when a newspaper in Lowell, Massachusetts, reported plans for a church in Washington funded by parishes across America. Not until 1913 did the project find its driving figure: Bishop Thomas Shahan, fourth rector of the adjacent Catholic University of America, presented the proposal to Pope Pius X, receiving his blessing and a personal financial contribution. Bishop Shahan died on March 9, 1932, and remains the only person entombed inside the basilica, beneath the Ave Maria Chapel that he himself named.
Two points are frequently confused. First, many visitors assume this building is the Catholic cathedral of Washington. It is not. The basilica has no bishop's cathedra and functions as a national pilgrimage shrine. The cathedral of the Roman Catholic Archdiocese of Washington is a separate church downtown, the Cathedral of Saint Matthew the Apostle.
Second, the capital also has Washington National Cathedral, a Gothic church belonging to the Episcopal Church in the Anglican tradition. Meanwhile, the description of St. Patrick's Cathedral in New York as the largest Gothic Catholic cathedral in the United States is qualified by architectural style and does not conflict with the National Shrine's overall size.
IIForty Years from Foundation Stone to Dedication
The building rose in two main phases separated by more than twenty years of depression and war. The first phase completed the lower level, the Crypt Church, so that worship could begin right away. The second phase erected the entire superstructure of the Great Upper Church in roughly five years. Mosaic decoration inside continued for nearly sixty years afterward.
- 1913Papal blessing for the projectBishop Thomas Shahan presented the plan to Pope Pius X, who blessed the endeavor and contributed personally.
- 1920Foundation stone laidThe foundation stone was set on September 23, 1920. The first Mass in the Crypt Church was celebrated on Easter Sunday in 1924.
- 1926 to 1931Crypt Church completedThe Crypt Church was finished in 1926 according to Shrine records, with the full substructure completed in 1931. SAH Archipedia records the lower church as completed in 1927.
- 1954 to 1959Building the Great Upper ChurchThe upper superstructure was erected under architect Eugene F. Kennedy Jr. Shrine publications state work resumed in 1955, whereas SAH Archipedia dates Kennedy's phase from 1954 to 1959.
- 1959Dedication of the Upper ChurchOn November 20, 1959, the Great Upper Church was dedicated. The Christ in Majesty mosaic in the north apse was the only major interior mosaic completed by that day.
- 1990Elevated to Minor BasilicaOn October 12, 1990, the Holy See conferred the title of minor basilica upon the National Shrine.
- 2006Our Lady of La Vang ChapelLocated on the Crypt level and gifted by Vietnamese-American Catholics, the chapel was dedicated on October 21, 2006.
- 2017Trinity Dome mosaicThe mosaic of the central Trinity Dome was dedicated on December 8, 2017, bringing the architectural decoration of the domes to completion.
Three discrepancies between sources are noted directly by the library. First is the completion year of the Crypt Church: Shrine literature gives 1926, whereas SAH Archipedia of the Society of Architectural Historians states that the lower church was completed in 1927. Second is the year construction resumed on the Upper Church: the Shrine records 1955, while SAH Archipedia notes that Eugene F. Kennedy Jr. oversaw construction from 1954 to 1959.
Third, and most notable, is floor area. Shrine publications cite a gross floor area of more than 200,000 square feet (about 18,600 square meters) and rank the building among the ten largest churches in the world. SAH Archipedia lists 77,500 square feet (about 7,200 square meters) and ranks it eleventh in the world. The Shrine's figure likely counts the combined gross area of both levels and auxiliary spaces, whereas the smaller figure measures only the main church footprint. The library presents both numbers without choosing one over the other.
IIINeo-Byzantine and Romanesque Masonry Without Steel Beams
Architect Charles D. Maginnis of the Boston firm Maginnis and Walsh chose a Neo-Byzantine and Romanesque synthesis, partly because, as SAH Archipedia observes, that structural system allowed builders to erect the exterior shell and finish the interior chapels incrementally. Built on a Latin cross plan, a great polychrome dome rises over the crossing, its exterior clad in blue, yellow, and red tiles bearing Marian symbols. The structure is entirely masonry: Indiana limestone, brick, and tile vaulting, without structural steel beams, framework, or columns. Shrine records state that the building contains 11.5 million bricks.
The interior of the Great Upper Church draws inspiration from Saint Mark's Basilica in Venice: five domes follow one another along the central axis, with walls and vaults sheathed in Venetian glass mosaic, French limestone, and polished marble that diffuse a soft light. Shrine documentation describes the building as housing the world's largest collection of contemporary ecclesiastical art, including sculptures by Ivan Meštrović and Lee Lawrie.
Set in the north apse and designed by Polish-born artist John de Rosen, covering 3,610 square feet (about 335 square meters) with 3,000 shades of Venetian glass, including 300 shades of red alone. It was the first mosaic completed in the Upper Church.
The central dome, spanning 18,300 square feet and assembled from more than 14 million hand-cut glass tesserae depicting the Most Holy Trinity, the Immaculate Conception, and saints associated with the United States. Dedicated on December 8, 2017.
Proceeding from the south entrance toward the north apse along the New Testament timeline are the Incarnation Dome (3,780 sq ft, dedicated November 17, 2007), Redemption Dome (3,780 sq ft, dedicated November 16, 2006), Trinity Dome (2017), Sanctification Dome (3,950 sq ft, 1968), and Triumph of the Lamb Dome (1966).
A broad, low-vaulted space with three apses and a central vault tiled in gray acoustic Guastavino tile according to SAH Archipedia. It is the oldest part of the sanctuary, hosting Mass since Easter 1924.
The campanile rises 329 feet (about 100 meters) and houses a 56-bell carillon weighing a combined 37,150 pounds, dedicated in 1963.
| Feature | Measurement | Source |
|---|---|---|
| Overall length | 459 ft, about 140 m | SAH Archipedia |
| Great dome height | 237 ft, about 72 m | SAH Archipedia |
| Knights' Tower height | 329 ft, about 100 m | National Shrine and SAH Archipedia |
| Front recessed portal | 96 ft high, 22 ft deep | SAH Archipedia |
| Floor area | Over 200,000 sq ft | National Shrine, SAH lists 77,500 sq ft |
| Chapels and oratories | Over 80 | National Shrine |
IVLandform and Orientation
Before reading the site, one point should be stated plainly: Catholicism has no doctrine of geomancy. Early Christian custom oriented the sanctuary toward the east, the direction of the rising sun, as a sign of the risen Christ. Yet that custom is not mandatory, and this basilica is a clear example: Shrine documentation refers to the apse holding the Christ in Majesty mosaic as the North Apse, meaning the main liturgical axis runs north-south, with the high altar in the north and the main portals opening toward the south. The reading below applies traditional Vietnamese geomancy (phong thủy) simply to give readers a comparative perspective. It does not appear in Shrine documents, and the architects did not consult geomancy when laying out the plan.
The first thing a reader trained in Vietnamese site-reading notices is the compass orientation. With the sanctuary in the north and the main doors looking south, the building sits north and faces south. In classical Vietnamese and Chinese manuals, sitting north and facing south is the cardinal orientation favored for imperial palaces and village communal halls, catching warm sunlight while turning its back to cold northern winds. Here that alignment resulted from the geometry of the university parcel along Michigan Avenue rather than any geomantic intention.
Second is the forecourt (minh đường). Stretching before the southern facade are open approaches and tree-lined university lawns unblocked by high-rise towers. Traditional site-reading values a level, open expanse in front of the main portal where vital energy can gather before entering the hall.
Third is the architectural form. A great rounded dome crowns the center while a tall, slender square tower stands offset to one side. In traditional Vietnamese mountain-form reading, a rounded dome corresponds to Metal and an upright column corresponds to Wood, while a single tall spire beside a main hall is sometimes read as a literary brush peak (văn bút), associated with scholarship and letters. Because the basilica stands directly beside a university campus, that reading happens to echo the setting, though a freestanding campanile beside a domed church is simply a classic Italian and Byzantine architectural convention.
VLiturgical Feasts and Vietnamese Catholic Pilgrimages
As a national Catholic shrine, the basilica follows the general Roman liturgical calendar on the Gregorian reckoning, supplemented by anniversaries tied to the Immaculate Conception and annual pilgrimages by cultural communities across the United States. Only dates are recorded below, without daily Mass hours.
| Date | Calendar | Observance | Description |
|---|---|---|---|
| December 8 | Roman Catholic liturgical calendar, Gregorian | Solemnity of the Immaculate Conception | Patronal feast of both the Basilica and the United States, the principal annual liturgy. |
| November 20 | Gregorian anniversary | Anniversary of the Dedication of the Great Upper Church | Commemorates the dedication of the Upper Church in 1959. |
| August 15 | Roman Catholic liturgical calendar | Solemnity of the Assumption of the Blessed Virgin Mary | One of the major Marian solemnities of the liturgical year. |
| November 24 | Roman Catholic liturgical calendar | Memorial of Saint Andrew Dũng-Lạc and Companions | Honors the 117 Vietnamese Martyrs, whose names are inscribed on the bronze plaque in the Our Lady of La Vang Chapel. |
| Month of May | Gregorian calendar, Month of Mary | Annual Pilgrimage of Asian and Pacific Island Catholics | Held annually, with the 22nd pilgrimage celebrated on May 3, 2025, featuring active participation by Vietnamese-American Catholic communities. |
Regarding the Vietnamese community: the Our Lady of La Vang Chapel on the Crypt level was gifted by Vietnamese-American Catholics and dedicated on Saturday morning, October 21, 2006. According to Shrine documentation, the focal point of the chapel is a 5-foot marble statue of Our Lady of La Vang holding the Christ Child atop a pedestal of Red Carrara marble from northern Italy and Argentina Blue marble, while to the right is a Venetian glass mosaic of the apparition in the La Vang jungle, and to the left is a glass mosaic after the painting The Martyrs of Vietnam accompanied by a bronze plaque inscribed with the names of the 117 canonized martyrs. According to Radio Free Asia (RFA), roughly 8,000 faithful from across the United States attended the 2006 dedication with more than twenty community delegations in procession, and the chapel floor features a bronze-drum motif with twelve stars and four Lac birds. According to VietCatholic, the Federation of Vietnamese Catholics in the USA organizes multi-day national pilgrimages to Our Lady of La Vang at the basilica, holding its fourth pilgrimage in June 2011. According to the Catholic Standard, during the 22nd annual Asian and Pacific Island Catholic Marian Pilgrimage on May 3, 2025, the Our Lady of La Vang community from Chantilly, Virginia, performed a liturgical offering dance and carried the palanquin of Our Lady of La Vang, while Vietnamese parishioners from Richmond led the Rosary in Vietnamese.
The tradition of Our Lady of La Vang comes from Quảng Trị Province in central Vietnam: in 1798, while persecuted Catholics were hiding in the La Vang rainforest and praying the Rosary beneath a great tree, the Virgin Mary is said to have appeared in a radiant cloak to console them and show them indigenous fern leaves to treat their illnesses. Shrine publications recount that pious tradition as handed down by the faithful.
VILocation And How To Get There
- Address
- 400 Michigan Avenue NE, Washington, DC 20017 (cạnh Đại học Công giáo Hoa Kỳ)
- Getting there
- The basilica is located at 400 Michigan Avenue NE in Washington, D.C., directly beside the campus of The Catholic University of America. The nearest Metrorail stop is Brookland-CUA Station on the Red Line, about a ten-minute walk away.
- Coordinates
- 38.9334, -77.0007
Because the basilica is an active sanctuary celebrating daily Mass and confessions, visitors are expected to follow the customs of a house of worship: dress modestly, remove hats upon entering, and maintain silence in the Great Upper Church and side chapels. While Mass is underway, architecture visitors should remain toward the rear rather than walking between the pews. Worshipers often kneel in quiet prayer inside the Our Lady of La Vang Chapel, so please step lightly and yield space to those praying.
Nearby places in the library
VIIContribute To This Page
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Góp ảnh, thông tin hoặc video cho Vương cung thánh đường Đền thờ Quốc gia Đức Mẹ Vô Nhiễm Nguyên TộiEveryone is welcome to enrich this page: a photo you took, a detail the page misses, a short video. Every contribution is read and answered.
Thầy Ưng Khiêm mời cộng đồng cùng làm giàu trang này. Ảnh chụp tận nơi, một chi tiết lịch sử chưa được nhắc, một đoạn video ngắn: mọi đóng góp đều được đọc và trả lời.
No community contribution yet. You could be the first. Chưa có đóng góp nào từ cộng đồng. Bạn có thể là người đầu tiên.
?Quick Questions
Is the Basilica of the National Shrine of the Immaculate Conception the largest church in the United States?
According to Shrine documentation, it is the largest Roman Catholic church in North America, with a gross floor area exceeding 200,000 square feet. SAH Archipedia records a smaller footprint of 77,500 square feet and ranks it eleventh among the largest churches in the world. Because the two numbers likely reflect different ways of measuring the two levels, the library records both. The building is 459 feet long and its dome rises 237 feet high.
When was the Basilica of the National Shrine of the Immaculate Conception built?
The foundation stone was laid on September 23, 1920. The Crypt Church was completed in 1926 according to the Shrine, or 1927 according to SAH Archipedia. The Great Upper Church was built between roughly 1954 and 1959 and dedicated on November 20, 1959. Pope John Paul II elevated the Shrine to a minor basilica on October 12, 1990, and the final central dome mosaic was dedicated on December 8, 2017.
When was the Our Lady of La Vang Chapel in Washington dedicated?
Located on the Crypt level and gifted by Vietnamese-American Catholics, the chapel was dedicated on October 21, 2006, with roughly 8,000 faithful in attendance according to RFA. Inside stand a 5-foot marble statue of Our Lady of La Vang holding the Christ Child on a Red Carrara marble base, Venetian glass mosaics depicting the 1798 apparition and the Vietnamese Martyrs, and a bronze plaque listing the 117 canonized saints.
What does the Immaculate Conception mean?
It is a Catholic dogma defined in 1854 teaching that the Virgin Mary, from the first moment of her conception in her mother's womb, was preserved by God from original sin. It refers to the conception of Mary herself rather than the virginal conception of Jesus, two teachings that are often confused. Its feast day is December 8, which is also the patronal feast of the United States.
Is the National Shrine of the Immaculate Conception the cathedral of Washington, D.C.?
No. It is a national pilgrimage shrine and minor basilica, and it does not house a bishop's cathedra. The Catholic cathedral of the Archdiocese of Washington is the Cathedral of Saint Matthew the Apostle downtown. Meanwhile, Washington National Cathedral on Wisconsin Avenue belongs to the Episcopal Church in the Anglican tradition and is a completely separate institution.