455 Massachusetts Avenue

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.

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 Old Engine Company No. 6 at 438 Massachusetts Ave in Washington, DC is a former District of Columbia Fire Department building which housed Engine 6 between February 17, 1879, and June 27, 1974. The two-story brick building was built during the volunteer period and is the only remaining example from that time.In 2012, the location was reopened as a restaurant.

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.

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.

The Northern Liberty Market, later called Convention Hall Market and Center Market, was located on the east side of 5th Street NW, between K and L, in the present-day Mount Vernon Triangle neighborhood of Washington, D.C. It operated from 1875 to 1963.

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 Sixth & I Historic Synagogue is a non-denominational, non-membership, non-traditional Jewish synagogue located at the corner of Sixth Street and I Street, NW in the Chinatown neighborhood of Washington, D.C. It is one of the oldest synagogues in the city. In addition to hosting religious services for different Jewish denominations, the synagogue hosts many lectures, concerts, and art exhibitions for the general public.