Lyndon Baines Johnson Memorial Grove on the Potomac

On Columbia Island, along the Mount Vernon Trail

While lingering is not recommended for security reasons, you should know it is the largest office building in the world, and covers 4 zip codes. (Army, Navy, Air Force and Department of Defense). Tours are available by online reservation made 14-90 days in advance. The Pentagon Memorial is open 24 hours to visitors on the Washington Blvd side, where Flight 77 hit. Photography is allowed at the memorial, but is not permitted anywhere else on the Pentagon grounds— take photos anywhere else on site, and you may face a lengthy interrogation by the Pentagon Police and will probably be asked to delete the images. On a lighter note, the interior courtyard is irreverently referred to by employees as "Ground Zero," as it was the target of a number of Soviet missiles during the Cold War. There is no public parking at the Pentagon but it is about a 5-minute walk from the Pentagon City Mall through a tunnel.

A historic bridge built in 1932 providing a line-of-sight between Arlington House and the Lincoln Memorial, symbolizing the rapprochement between the North and South after the Civil War

Just outside the Pentagon, and accessible to visitors

Honors the Naval Construction Battalions, with panels depicting their missions since 1942.

Contains information about the cemetery and the tomb of the unknown solder. There is also a large parking garage which can be a good place to dump your car before catching the subway into D.C.