This is definitely one of the prettiest train stations I've seen in the United States. Readers of this blog know I'm not one of those "America rules!" type dittoheads, but I think we do train stations well in this country.
Plenty of light, nice design, and a cavernous waiting room that's in full view of the schedule.
Okay, just the once: America rules!

Union Station's waiting room

The paint and woodwork that adorns the vaulted ceilings evokes the Alhambra, at least for me.

A courtyard with a fountain in the far distance.

Some restoration is in order, but Union Station is holding up pretty well.

Inlaid floors, plenty of light, eight-pointed stars... definitely Moorish.