Union Terminal, Cincinnati, OH
Cincinnati's Union Terminal is one of the country's most grand—and most important—Art Deco structures. Designated as a National Historic Landmark, the station is also one of the last remaining grand Art Deco-style rail terminals. Designed in 1933 by the firm of Alfred Fellheimer and Steward Wagner, with help from Paul Cret, the building cost $41 million to complete and spans 287 acres. Its interior Rotunda dome is 180 feet wide and soars to 106 feet, making it the second largest half dome in the world. Today, the terminal is in need of extensive repairs, having suffered from deterioration and water damage, even as it remains an important building for the city of Cincinnati—it houses the Cincinnati Museum Center and receives over 1.4 million visitors a year.