Fortress of Marvels

The Fortress of Marvels was a space-station, an orbiting fortress created by Mighty Maid in orbit of the planet Terra, a distant planet from Earth that bears many similarities. Like Superman's Fortress of Solitude, it contains many trophies and souvenirs from Mighty Maid's adventures. The entrance key is hung on a radioactive asteroid so that it can never be picked up or used by passing spacecraft. ("The Second Supergirl!")