Dupont Circle Station

 is part of the Metro system under the Capital Wasteland. It is mainly collapsed and you have to go through a Raider-infested cave to get to Metro Central.

The name of this station appeared on an advertisement for the Metro.

Notable loot
Lying, Congressional Style is in the room with the Protectron, on a desk in a bin, next to the door

Bugs
Just past an area with several raiders and turrets, there is a utility gate. If the player has Dogmeat as a companion, he will get stuck trying to pass through the gate and run, turning in different directions. This can be overcome by pushing him through and closing the gate behind yourself.