The Boulder City ruins are a location in the center of Boulder City, between the 188 trading post and Hoover Dam. The ruins are blocked off from the rest of the city by rubble and a NCR barricade. Lt. Monroe is in front of this barricade when you first arrive.
The ruins consist of several bombed-out buildings. The entrance is controlled by Lieutenant Monroe. Several NCR Troopers are inside and they have the Khans pinned down in two partially destroyed buildings. During the quest They Went That-a-Way and Boulder City Showdown, the Great Khans have two NCR squad members held hostage in a building on the west side that has a open front door and a locked back door. Jessup and another Great Khan are using a small shop as a refuge.
- Boulder City Showdown - Help the NCR resolve the situation, make peace with or draw the Great Khans members in to a trap.
The Boulder City ruins only appear in Fallout: New Vegas.