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National Building Museum
December 30, 1970 [1] The Lockwood–Mathews Mansion is a Second Empire style country house in Norwalk, Connecticut. Now a museum, it was built in 1864-68 for railroad and banking magnate LeGrand Lockwood. The 62-room 44,000 square feet (4,100 m 2) [3] mansion was listed on the National Register of Historic Places and was declared a National ...
National Archives Building
Lincoln Memorial
Andrew Carnegie Mansion
The building houses the collections of two Smithsonian museums: the National Portrait Gallery and the Smithsonian American Art Museum. The Old Patent Office Building model room's interior during the American Civil War, c. 1861–1865 The Old Patent Office model room in 2011, now the Great Hall of the National Portrait Gallery
Treasury Building (Washington, D.C.)
Cost Per Room. Knowing the average cost per room can help determine the cost of building a new house. Assuming your house will cost an average of $150 per square foot, here's how much it costs on ...