The Avengers Mansion is the homeplace to the Avengers. The mansions upper levels are for those who live in the mansion, where there is a lounge, library, kitchen (with chef on call), and many other things. The lower levels are where most of the high-tech equipment can be found, with shuttles, training areas, and much more. J.A.R.V.I.S. runs the entire system, and doesn't allow anyone to enter without an ID pass. Only enter if you have authorization, or pay the consequences.