Omaha Union Station (1931) was one of the first Art Deco train station in the United States. It replaced the former Omaha Union Station built in 1899 (seen here in this old post card). The Art Deco Union Station closed for rail service in the 1970s and now houses the Durham Museum.
Full set of photos may be seen here, on Flickr.
Omaha’s other passenger train station, the Italianate Burlington Station (1898) also closed in 1974 when a new Amtrak station was built a block or so to the east. The Burlington Station just underwent a major renovation, see my previous blog post and this set of photos on Flickr.
I’ve shot the Durham Museum / Union Station before. See, e.g. here for a closer up shot of the front façade, here for a close up of one of the south side entrances, and here for another shot of the interior.