Rockopolis

Rockopolis - This location is not a major landmark nor a random location and will not appear on your map. It is located due west of Smith Casey's Garage, due north of Girdershade and South East of the Yao Guai Tunnels. The entrance is a boulder that can be interacted with like any other door or entrance. Facing the boulder, there is one dead tree on the right, two on the left. And as the attached pictures show, there is a string of flags above the boulder.

History
According to files on Herbert Dashwood's computer and the accounts of The Adventures of Herbert "Daring" Dashwood on Galaxy News Radio, Rockopolis was once a hidden underground village. The inhabitants would only allow outsiders in if they presented with a secret knock. The mayor or king of Rockopolis at the time was King Crag. Herbert lead Penelope Chase, a slaver leader, to Rockopolis. According to Herbert Dashwood's computer, the incident lead to the enslavement of the city's population and the destruction of the city itself.

Adversaries
There is no one living inside. However, I encountered 2 Radroaches outside at the entrance, and for some unknown reason, there are a bunch of robots guarding the area. Protectrons, Robobrains, Sentry Bots, etc. as well as some Radscorpions and Giant Radscorpions.