Organization of American States Building is at 17th St. N.W. and Constitution Ave. N.W. It is the headquarters of the general secretariat of the Organization of American States (OAS). Visitors can see the landscaped patio entrance hall, the Hall of Heroes and Flags, an art gallery, the Liberator Simón Bolívar Room, the Hall of the Americas and an Aztec Garden.
Note: Due to security concerns, only groups who have made advance tour reservations are permitted in the building.