Captain America #117 (September, 1969)
The Uncanny X-Men #169 - Catacombs
New York, New York; formerly Avengers Mansion, New York City, New York; S.H.I.E.L.D.
The Xavier Institute, Salem Center, Westchester County, New York State, (former) The Alley (beneath Manhattans surface), X-Factor Is sentient starship