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Florida has some good stuff to this is one my favorite its an abandoned rocket testing site where they would put the rockets upside down and let them rip must have been epic. I always meant to go there but never did. You need climbing gear and some experienced climbers, unfortunately when I lived in FL only one of my friends was a good climber and you probably want a team of four. Unfortunately the site keeps getting more and more beat up people go in there and try to break everything thus making it a little less cool with each passing year.
Check out some of the other stuff on this site it might give you some ideas.
Exploring old mines etc is very very dangerous even the most experienced explorers can quickly find themselves in a totally screwed situation. Its not something to do lightly or with less than a full kit and and similarly experienced crew.