Oh awesome, now the Disney club has made it's way into the thread.
Make sure to let everyone know, I think it is DisneyWorld, but could be DisneyLand, that has a full underground tunnel system that is basically under the whole park. Like a little city under the ground. Obviously for when they prepare for the take over.
Disney World has a full documented underground tunnel system, officially it is for the use of performers so they can get around the park without being seen in the wrong section of the park in the wrong type of costume.
It's also sadly not very secret or mysterious, they give out guided tours to anyone over the age of 16.