Crystal City

Crystal City is a district of Washington, D.C. in the Capital Wasteland $$ Cut from the final version of the game, its only remains are the signposts of the Crystal City Metro station(s).

Appearances
Crystal City was going to appear in Fallout 3 but was cut from the final version of the game.

Behind the scenes
In real life, Crystal City is located directly and shortly south of the Pentagon, easily seen on a map. It is highly plausible that Crystal City was an early version of the Mason District, since the Mason District - at least as portrayed in the game - does not exist in real life. Furthermore, the Mason District is in roughly the same location in which Crystal City would be.