Cavern City was the city which Rook Bartley spent the first years of her life, before leaving due to antagonizing conflict. Most sources place its construction within South America, more specifically Brazil. (New Generation: "Hard Times") However, one source suggested that it was built within the Southern Grand Cannon. According to this source, it was the home of the Wolf Pack after they retook it from the Zentraedi during the Malcontent Uprisings. (Robotech: The Malcontent Uprisings)