Harry W. Gray House

Henderson Hall is a military installation of the United States Marine Corps (USMC) located in Arlington County, Virginia, near the Pentagon, on the southern edge of the Arlington National Cemetery and next to Fort Myer. Currently, it is part of Joint Base Myer–Henderson Hall. Henderson Hall is named for Brevet Brigadier General Archibald Henderson, the fifth and longest-serving Commandant of the Marine Corps.

Abbey Mausoleum was a mausoleum in Arlington County, Virginia, in the United States founded in 1924. One of the most luxurious burial places in the Washington, D.C., metropolitan area, many famous individuals, judges, and military leaders were buried there. The mausoleum encountered financial difficulties and declared bankruptcy in 1966. It suffered vandalism numerous times, and several graves were desecrated. Remains buried there were disinterred and reburied elsewhere, and it was demolished in February 2001. Several architectural features of the structure were salvaged. It was located just outside Arlington National Cemetery next to Henderson Hall (Arlington, Virginia).

The Argonne Cross Memorial is a memorial to American military personnel who died fighting in France during World War I. It was erected on November 13, 1923, and stands in Section 18 of Arlington National Cemetery in Arlington County, Virginia, in the United States.

The Navy Annex was a building near the Pentagon in Arlington, Virginia mainly used as offices for the United States Department of the Navy. The facility was also known as Federal Office Building 2. It was demolished in 2013 to make room for an expansion of Arlington National Cemetery and other uses.

Fort Richardson was a detached redoubt that the Union Army constructed in September 1861 as part of the Civil War defenses of Washington (see Washington, D.C., in the American Civil War). The Army built the fort shortly after its rout at the First Battle of Bull Run (Manassas) in late July 1861. The Army named the fort after General Israel B. Richardson, whose division had been deployed to defend the City of Washington against attack by way of the Columbia Turnpike.The structure, which was the highest fortification on the Arlington Line, occupied a commanding position on the crest of a ridge. It had a perimeter of 316 yards and emplacements for 15 guns, including a 100-pound Parrott rifle that could sweep a sector from Fort Ellsworth to Fort DeKalb (later named Fort Strong). The fort housed bomb-proofs and two ammunition magazines, and was adjacent to a military encampment. A May 17, 1864, report from the Union Army's Inspector of Artillery (see Union Army artillery organization) noted the following: Fort Richardson, Major Trumbull commanding.–Garrison, three companies First Connecticut Heavy Artillery–1 major, 12 commissioned officers, 1 ordnance-sergeant, 412 men. Armament, two 24-pounder field howitzers, six 24-pounder siege (smooth), one 100-pounder rifled Parrott, three 30-pounder rifled Parrotts, two 24-pounder Coehorn mortars, one 10-inch mortar. Magazines, two: dry and in good order. Ammunition, full supply and serviceable. Implements, complete and in good order. Drill in artillery, fair. Drill in infantry, fair. Discipline, fair. Garrison sufficient for the work. After the Civil War ended in 1865, the United States Army returned many of the properties that contained its fortifications in the Washington, D.C., area to the properties' rightful owners. In some instances, the Army compensated the owners for the use of the properties and for damages that had resulted from the Army's wartime activities. In addition, the Army sold at auction many of the fortifications' materials.The remnants of Fort Richardson are presently located on the grounds of the Army Navy Country Club in Arlington County, Virginia. The fortification's earthen south wall and ditches are well-preserved. A historic marker that the Arlington County government erected in 1965 stands along the Country Club's private access road (Memorial Drive) alongside the remnants of the fort.

Fort Albany was a bastioned earthwork that the Union Army built in Arlington County (known at the time as Alexandria County) in Virginia. The Army constructed the fort during May 1861 as part of its Civil War defenses of Washington (see Washington, D.C., in the American Civil War).The fort had a perimeter of 429 yards and emplacements for 12 guns.Fort Richardson, Fort Craig and Fort Tillinghast provided supporting fire for the fort. A May 17, 1864, report from the Union Army's Inspector of Artillery (see Union Army artillery organization) noted the following:Fort Albany, Captain Rhodes commanding.–Garrison, one company First Massachusetts Volunteers–5 commissioned officers, 1 ordnance-sergeant, 145 men. Armament, two 24-pounder field howitzers, four 24-pounder siege, two Parrotts, one Coehorn mortar, one 10-inch mortar. Magazines, two; dry and in good order. Ammunition, full supply and in good condition. Implements, complete and in good order. Drill in artillery, fair. Drill in infantry, fair. Discipline, fair. Garrison of sufficient strength. No trace of the fort remains, although a historic marker shows the location where the fort once stood, guarding the approach to the Long Bridge along the Columbia Turnpike, near the modern-day Pentagon. The ground on which the Fort stood was cut away during the construction of the Henry G. Shirley Memorial Highway, in 1942.

Fort Craig was a small lunette that the Union Army constructed in September 1861 in Arlington County (at that time Alexandria County) in Virginia during the American Civil War. The lunette was part of the Civil War defenses of Washington (see Washington, D.C., in the American Civil War). The lunette stood less than a mile away from Arlington House, the Union-occupied estate of Confederate General Robert E. Lee. It remained in use throughout the war. The lunette was part of the Arlington Line. It tied into Fort Tillinghast approximately 0.6 miles to the north and Fort Albany approximately 0.9 miles to the south. The fortification helped guard the capital from an approach along the Columbia Turnpike and over the Long Bridge on the Potomac River.

Prospect Hill in Arlington County, Virginia is the former location of a Federal style mansion built in 1841 by successful contractor James Roach in Arlington County (then named Alexandria County). The house was built on Arlington Ridge Road. In 1861, the land was seized and vandalized by Union soldiers during the construction of Fort Runyon and Fort Albany. The house was demolished in 1965, but an historic marker has been placed at the site. Roach had also supplied most of the materials for the Alexandria Canal, the Aqueduct Bridge, and the Alexandria, Loudoun and Hampshire Railroad.After the September 11 attacks, Prospect Hill became a popular spot for photographs to take photos of The Pentagon after it was crashed into by American Airlines Flight 77.The site is also home to the 0.4 acre Prospect Hill Park.

Isaac William Littell (5 December 1857 – 1 May 1924) was a United States Army brigadier general. He was awarded the Army Distinguished Service Medal for meritorious and distinguished service during World War I. Specifically, Littell was honored for building the camps and cantonments of the Army raised in the summer of 1917 as chief of the Cantonment Division of the Quartermaster General's Office.

The Arlington Historical Museum in Arlington, Virginia houses 350,000 artifacts on rotating display. Its exhibits interpret the history of the area from Captain John Smith's encounter with Algonquin Native Americans in 1608 to the near-present, including a letter exchange between local students and Ronald Reagan following the assassination attempt on Reagan. Established in 1962, the Arlington Historical Museum is operated by the Arlington Historical Society. It is housed in the former Hume School. The Society also operates the 18th-century Ball-Sellers House as a historic house museum.

The Hume School is an 1891 former school building in the Arlington Ridge neighborhood in Arlington County, Virginia. It is the oldest school building in Arlington County. It has been the home of the Arlington Historical Society since 1960.

The United States Air Force Memorial honors the service of the personnel of the United States Air Force and its heritage organizations. The Memorial is located in Arlington County, Virginia, on the former grounds of the Navy Annex near The Pentagon and Arlington National Cemetery. The Memorial is southwest of the intersection of Columbia Pike and South Joyce Street and is accessible from the north side of Columbia Pike. It was the last project of American architect James Ingo Freed (known for the design of the United States Holocaust Memorial Museum) with the firm Pei Cobb Freed & Partners.