Union Station of L.A. is certainly one of the most famous and most good-looking train stations of the world and served as a movie location in several Hollywood movies like most recently in Dark Knight Rises.
I haven't made a picture of the front entrance -forgot it- but the backyard is beautiful for a station area.
Seating is first class: fine (artificial) leather armchairs.Building itself is nice as well, sort of Mexican style...as far as my judgement goes.