Number three in a series of increasingly complicated bunkers by DucTape! The future fort is set in a time where portals and practical wireless electricity are real things, so they are used heavily in the fort. The fort has running water (with a water filter/cooler), an armory, a fitness center, a hospital, a jail, a sleeping area, a kitchen, a dining room, an explosives room, a generator, a laboratory, a greenhouse, a portal lobby, and more. It's pretty much the best thing ever.
Also, it makes a decent bunker. And by decent, I mean it can withstand a good amount of thunder.
EDIT: Also, i think it works with or without ambient heat, but I did most of the testing with it off.