Subtropolis

There are all kinds of subterranean places all over the world. Some of the very old ones are just now being discovered with new technology, others are only know about by a very few people. In Galveston, Texas there were old underground munition storage facilities that were discovered in the late 60's, early 70's. One of them was refurbished & used as a night club. One of the other ones was a haven for rattle snakes & water moccasins. It was filled up & covered over, to keep the stupid people out of it.