Bangor Dome

 is a location in that appears in the Future. Crono Marle and Lucca get there through a portal from Present. It is first encountered during the chapter Beyond The Ruins. It is completely deserted save for the gate to the present, and a sealed door. Behind the sealed door there is a room with bad ventilation and three chests. Within the chests there are the following items: an Alluring Top, Full Ether, and a Workman's Wallet.

It also happens to be how the party first gets to the Future, when they are running from the Chancellor in the present.