The State Department offers a free, hour long tour of the Diplomatic Reception Rooms; however reservations must be made 90 days in advance.
The tour will include an overview of the rooms and their contents with selected emphasis on some items and their history. The tours are limited to the 8th floor area specified. All other areas of the Department of State are restricted.
Should you wish to make a reservation, go here
or contact my office.
Should you have any further questions, they offer an extensive FAQ page here