Dalecarlia Reservoir

The Dalecarlia Tunnel in Brookmont, Maryland, near Washington, D.C. is a former railroad tunnel that presently carries the Capital Crescent Trail underneath MacArthur Boulevard and the Washington Aqueduct. It was built in 1910 as part of the Georgetown Branch of the Baltimore and Ohio Railroad. It is a Roman arch tunnel, measuring 18 feet (5.5 m) wide by 340 feet (100 m) long. It features decorative brick facings on both ends and is lined with brick throughout its length. CSX Transportation, the successor to the B&O Railroad, ceased train operations through the tunnel in 1985 and officially abandoned the rail line in 1986.

Sibley Memorial Hospital is a non-profit hospital located in The Palisades neighborhood of Washington, D.C. It is fully accredited by the Joint Commission on Accreditation of Healthcare Organizations, and is licensed by the District of Columbia Department of Health and Human Services. The hospital specializes in surgery, orthopedics, and oncology services. It has been part of Johns Hopkins Medicine since 2010.

The Washington Aqueduct is an aqueduct that provides the public water supply system serving Washington, D.C., and parts of its suburbs, using water from the Potomac River. One of the first major aqueduct projects in the United States, the aqueduct was commissioned by the U.S. Congress in 1852, and construction began in 1853 under the supervision of Montgomery C. Meigs and the U.S. Army Corps of Engineers. Portions of the aqueduct went online on January 3, 1859, and the full pipeline began operating in 1864.: 68 The system is owned and operated by the U.S. Army Corps of Engineers and has been in continuous use ever since. It is listed as a National Historic Landmark and the Union Arch Bridge, where it is listed as a Historic Civil Engineering Landmark.

Washington Conservatory of Music and School of Expression was a private music academy founded by Harriet Gibbs Marshall in 1903 in Washington, D.C. to train African Americans in music. The Conservatory remained open until 1960 making it the longest operating music school for African Americans.

Kent is a neighborhood in Northwest Washington, D.C. in the United States, bounded by Loughboro Road to the north, MacArthur Boulevard to the southwest, and Chain Bridge Road and Battery Kemble Park to the southeast. It is a suburban neighborhood, home to some of the most expensive homes in the city with an average home sales price in 2012 of $1.7 million ($2.17 million today).

Little Falls Branch, a 3.8-mile-long (6.1 km) tributary stream of the Potomac River, is located in Montgomery County, Maryland. In the 19th century, the stream was also called Powder Mill Branch. It drains portions of Bethesda, Somerset, Friendship Heights, and Washington, D.C., flows under the Chesapeake and Ohio Canal (C&O), and empties into the Potomac at Little Falls rapids, which marks the upper end of the tidal Potomac.

The Chain Bridge is a viaduct which crosses the Potomac River at Little Falls in Washington, D.C. The steel girder bridge carries close to 22,000 cars a day. It connects Washington with affluent sections of Arlington and Fairfax counties in Virginia. On the Washington side, the bridge connects with Canal Road. Left turns onto the Clara Barton Parkway from the Chain Bridge are prohibited, but the reverse is permitted. On the Virginia side, the bridge connects with State Route 123 (Chain Bridge Road), which provides access to the George Washington Memorial Parkway. The Chain Bridge has three lanes (of which the center is reversible) and can be safely accessed by pedestrians and cyclists. The pedestrian sidewalk provides access to the Chesapeake and Ohio Canal towpath via a ramp. The bridge also carries water mains which provides Arlington County with water from the Washington Aqueduct.

The Marden House is a residence in McLean, Virginia designed by American architect Frank Lloyd Wright. It is located just off Chain Bridge Road and overlooks the Potomac River. Also known as "Fontinalis," it is named after Luis Marden (1913–2003), a writer, photographer, and explorer for National Geographic. It was designed by Wright in 1952 and was completed in 1959 at a cost of $76,000. The spot had caught Marden's eye in 1944 when he and his wife and had been fishing along the Potomac. After purchasing a plot of land, Marden continued the correspondence he had maintained with Wright since 1940, asking the architect to design a home for him. It was not until 1952 that the designs finally came. After Marden moved to a nursing home in 1998, the house was purchased by Jim Kimsey, co-founder of AOL, in 2000 for $2.5 million.

Spring Valley is a largely residential neighborhood in Ward 3, Northwest Washington, D.C. As of July 2021, it was the most expensive neighborhood in the District, with homes selling at a median price of $1.465 million.

The Intelligence Community Campus-Bethesda (ICC-B) is a campus in Brookmont, Maryland containing offices for several agencies of the United States Intelligence Community. The campus was created in 1945 and initially served as the headquarters of the National Geospatial-Intelligence Agency and its predecessor organizations. In 2012, it was transferred to the Office of the Director of National Intelligence and substantially renovated into an architecturally and functionally modern design.

The Massachusetts Parking Shops is a historical neighborhood shopping area built in 1936, among the first developments to integrate the automobile and shopping with off-street parking. It was developed in the modern Colonial Revival style by C. H. Hillegeist following the designs of E. Burton Corning. It was added to the National Register of Historic Places in 2003.Among the first stores in the small complex were a Sanitary Food Store and an A & P Grocery, a pharmacy, Homewood Hardware, Knife & Fork Delicatessen, Pat-a-Cake Bake Shop, Homewood Beauty Shop, Palace Laundry and a Gulf Oil filling station. National planning publications used the Massachusetts Avenue Parking Shops as a model and small commercial postwar shopping centers were influenced by the style.

The Dr. Franklin E. Kameny House in the Northwest Quadrant of Washington, D.C., is a two-story, brick Colonial Revival-style house built in 1955, with a screened porch and a one-car garage. It is significant for its association with gay rights activist Franklin E. Kameny (1925–2011), having served as his home and office, and as a headquarters for gay civil rights organizing.