Old Engine Company No. 6

455 Massachusetts Avenue is a high-rise office building located in the Mount Vernon Triangle neighborhood of Washington, D.C., United States. The 12-floor building was designed by Gensler and completed in 2007, and rises to 151 feet (46 m).

Seaton Park is a neighborhood-named pocket park located on National Park Service property at south of Massachusetts Avenue and north of I Street NW between 5th and 6th St NW in the Chinatown neighborhood of Washington, D.C. It is also referred to as Chinatown Park.

Milian Park is a neighborhood-named park located on National Park Service property at north of Massachusetts Avenue at I Street, NW in the Mount Vernon Triangle neighborhood of Washington, D.C. It is named after an inventor and scholar from Spain, Michael Austin Milian who died nearby in 1886.

Saint Mary, Mother of God, previously known as St. Mary's German Catholic Church, was founded in 1845 by German immigrants and was dedicated in 1890 as a parish. It is in the Roman Catholic Archdiocese of Washington's northwest-east deanery, and is known for formerly celebrating the traditional Tridentine Mass.

Bar Chinois is an Asian restaurant and wine bar in Mount Vernon Triangle, Washington, D.C. The menu includes dim sum. The Infatuation has described the cuisine as Chinese fusion.

The Jefferson Apartment Building is an historic structure located in the Mount Vernon Triangle neighborhood of Washington, D.C. The small middle-class apartment building was designed by George S. Cooper, who was a prolific apartment architect in the city. The structure features a Romanesque Revival façade. It was listed on the National Register of Historic Places in 1994.

The Luzon Apartment Building, also known as The Westover, is an historic structure located in the West End neighborhood of Washington, D.C. The building is one of the last surviving structures from the formative period of apartment buildings in the city. The Romanesque Revival building was designed by Nicholas T. Haller and completed in 1896. It was listed on the National Register of Historic Places in 1994.

The U.S. Government Accounting Office Building is an historic government office building, the headquarters of the Government Accountability Office. It is located at 441 G Street NW in Washington, D.C., adjacent to the National Building Museum. The building also serves as headquarters for U.S. Army Corps of Engineers. It was dedicated on September 11, 1951, by President Harry S. Truman.

Germuiller Row are historic structures located in the Chinatown neighborhood of Washington, D.C. It was listed on the National Register of Historic Places in 1994.

The Mount Vernon Triangle Historic District is a historic district in the Mount Vernon Triangle neighborhood of Washington, D.C., consisting of 22 contributing residential, commercial, and industrial buildings, and one known archaeological site. The area was once a working class neighborhood for mostly German immigrants and home to semi-industrial enterprises such as a dairy and an automobile repair shop. The Northern Liberty Market that once stood on the corner of 5th Street and K Street NW played a large role in spurring development in the surrounding area as did the streetcars on Massachusetts Avenue and New York Avenue. The historic district was added to the District of Columbia Inventory of Historic Sites in 2005 and the National Register of Historic Places in 2006. The 22 buildings in the district were constructed between 1869 and 1946. Two of the buildings included in the historic designation process, 470 and 472 K Street NW, collapsed in 2014. Many of the buildings in the district have undergone a restoration process. Prather's Alley, which was once lined with dwellings, stables, and industrial businesses, is being redeveloped into a place for community residents to gather.

Mount Vernon Triangle is a neighborhood and community improvement district in the northwest quadrant of Washington, D.C. Originally a working-class neighborhood established in the 19th century, present-day Mount Vernon Triangle experienced a decline in the mid-20th century as it transitioned from residential to commercial and industrial use. The neighborhood has undergone significant and rapid redevelopment in the 21st century. It now consists mostly of high-rise condominium, apartment and office buildings. Several historic buildings in the neighborhood have been preserved and are listed on the National Register of Historic Places. Mount Vernon Triangle is now considered a good example of urban planning and a walkable neighborhood.

dLeña is a Latin American / Mexican restaurant in Mount Vernon Triangle, Washington, D.C.