The Fort
is really Fortification Hill, Lake Mead, AZ
Real place, reimagined
Real-world photo: Wikimedia Commons
In the game
Caesar's Legion headquarters, built on the hill across the river from Hoover Dam.
The real place
A flat-topped basalt mesa on the Arizona side of Lake Mead, a former volcano.
Visiting
A rough trail climbs to the top; go early and carry plenty of water.