The tour lasts an hour and a half. The Pentagon is one of the world's largest office buildings. Approximately 23,000 Department of Defense staff work at the Pentagon every day. The Pentagon began its tour program as a special part of the Nation's Bicentennial celebration in 1976. Demand for these tours was so high that they were continued.
Group tours are available and can be requested online .
These rooms are used by the Secretary of State, the Vice President and Cabinet members for meeting and entertaining both foreign and domestic dignitaries. The Diplomatic Reception Rooms are furnished with historic American furniture, all provided through donations from private citizens. An online tour of the Diplomatic Reception Rooms is available through the State Department website . Public tours of the Department of State are available by reservation only. The State Department is a secure building and all visitors require picture identification.