Housed in the historic Pension Building , the museum presents exhibits, lectures, films, family programs and workshops on all aspects of architecture, building and historic preservation. Permanent Washington: Symbol and City exhibit chronicles the building of the nation's capital. Open: Monday-Saturday 10 a.m.- 4 p.m., Sunday noon - 4 p.m. Public tours daily starting at 12:30 p.m. Group tours by appointment.   Closed New Year's Day, Thanksgiving and Christmas. Admission: Free  Metro: Judiciary Square, Gallery Place-Chinatown.  Related Links: National Building Museum