Sentai Fortress

Sentai Fortress was the former headquarters of Exo Force, and as such was frequently attacked, taken over and/or destroyed by robots or brain-damaged Genkis. Following the discovery of the Golden City, Exo Force began frequently moving between the two, and finally abandoned it following the Zombie Incident. Afterwards, it was indicated that the fortress would be sold to someone else.

That "someone" would apparently turn out to be the robots, as Exo Force found the fortress being taken apart and rebuilt into a robot base when they returned there to pick up a CD Unit 1/Keiken had ordered them to bring back. During that encounter, much of the fortress was destroyed with a combination of dynamite, conveniently located liquid explosives, and the self-destruct device of a Meca One clone.

Later, during the X77 Incident, the fortress was used as a hiding place from infected Devastators.