Cape Citadel
A military base in Florida, this location marks the site of the first battle between Magneto and the X-Men.
Origin
The X-Men (chronologically) faced their first mutant super villain Magneto at Cape Citadel.
Creation
Cape Citadel was created by writer Stan Lee and artist Jack Kirby in 1963.
History
Similarly to The Cape which appears in Captain Marvel, Cape Citadel is based on Cape Canavral.
Other Media
Cape Citadel appears in X-Men The Animated Series in an episode that uses almost the exact same story line as X-Men #1 (Sep. 1963), apart from changing the roster and replacing Iceman and Angel with Storm, Rogue and Wolverine.