Old Post Office Tower - historic clock tower observation deck

The Old Post Office building on Pennsylvania Avenue features a 315-foot clock tower that has long served as a public observation point offering panoramic views of the National Mall and downtown Washington. The Romanesque Revival structure originally housed federal postal functions and is one of the city’s most prominent historic commercial buildings. The tower and its observation facilities have been managed as a visitor destination and appear in National Park Service and city tourism materials. The building’s clock tower is a documented architectural installation integrated into the urban streetscape of Pennsylvania Avenue.