Subject(s): United States Capitol Visitor Center (Washington, D.C.) | Emancipation Hall (United States Capitol Visitor Center, Washington, D.C.) | Emancipation Hall (United States Capitol Visitor Center, Washington, D.C.) -- Name. | Visitors' centers -- Washington (D.C.) -- Design and construction -- History. | Architecture -- Washington (D.C.) -- History. | Washington (D.C.) -- Buildings, structures, etc. | Principles and practice of physical planning. Regional, town and country planningIncluding: Land development. Plans. Arrangements of buildings in towns. Site planning. Grouping. Traffic routes. Public utilities