Chris Claremont, Paul Smith
George Pérez, Marv wolfman
The Uncanny X-Men #169 - Catacombs
"DC Comics Presents #26 (October, 1980)"
The Xavier Institute, Salem Center, Westchester County, New York State, (former) The Alley (beneath Manhattans surface), X-Factor Is sentient starship
Formerly Titans Island, New York City; Titans Tower, San Francisco