In Comics
Avengers #57 (October, 1968)
Giant-Size X-Men #1 - Deadly Genesis
Base
Mobile.
(current) Professor Charles Xaviers Institute for Higher Learning, Salem Center, Westchester County, New York (former) Muir Isle, Scotland,; a loft in Soho, Manhattan, Ust-Ordynski Collective, Lake Baikal, Siberia, U.S.S.R., X-Men Headquarters in Austra