Washington, DC
The Pentagon offers free tours to the public on weekdays, with options for individual walk‑in visits or group tours for parties of ten or more. Walk‑in visits begin at 9 a.m. and run hourly until 3 p.m.; each lasts about 90 minutes, covers roughly one mile, and includes several staircases. Group tours require reservations at least two weeks in advance, typically last between 30 and 90 minutes, and can be customized to fit the requested time frame. All tours start and finish at the Pentagon’s Metro entrance, where visitors must register upon arrival.