The Avengers Mansion/Foyer is the main hall of the mansion. This is the first room people come into when entering the mansion. It's a big marble room, and on the center of the floor is the Avenger's symbol. You can follow the Main Staircase up to the second floor, or go down either the North or South hall, which take you through many other places throughout the mansion. If you need help with anything, ask for J.A.R.V.I.S.