No fillies allowed
– Sign nailed to the front and written by a foal
Fallout: Equestria - Chapter 45
Rockopolis is a small cave, little more than an indentation on a ridge of rock. A sign was nailed to the entrance stating the cave was Rockopolis and that fillies weren't allowed. Judging from the small furniture found inside, Rockopolis may have been a club house, hideout or minor settlement for young colts. Homage was hiding from the Grand Pegasus Enclave inside Rockopolis.
Rockopolis is based on the minor location, Rockopolis from Fallout 3