Chris Claremont, Paul Smith
George perez, Marv wolfman
The Uncanny X-Men #169 - Catacombs
Crisis on Infinite Earths #4 (July, 1985)
The Xavier Institute, Salem Center, Westchester County, New York State, (former) The Alley (beneath Manhattans surface), X-Factor Is sentient starship
Qward, Antimatter Universe