The Weapon X Compound was a top secret underground laboratory that was built to house the Weapon X Project. When the test subject Wolverine went beserk and killed most of the people present, it was abandoned.
The Return of Weapon X
One of the few surviving guards who was stationed at the Weapon X Compound when Wolverine escaped re-established the Weapon X program years later and became The Director of the new project. The same Compound again served as the team's headquarters and Weapon X became a mutant strike-force consisting of Agent Zero, Aurora, Kane, Marrow, Mesmero, Sabretooth, Sauron, Wild Child and briefly Copycat and Deadpool.
The Director, Madison Jeffries and a disguised Mr. Sinister were also responsible for a mutant concentration camp created known as Neverland. The opportunist and insubordinate agent Brent Jackson later replaced The Director as the man in charge when he staged a mutiny allied with several members of the team he had manipulated.
Following Avengers vs X-Men, Cyclops created the Charles Xavier School for Mutants as a place to train the new mutants that were created when Hope removed the Phoenix Force from herself. The school was built using the grounds of an old Weapon X building, with its location kept a secret due to the fact that Cyclops and his teammates are on the run from the Avengers.
The School Faculty: Cyclops (Headmaster), Emma Frost (Headmistress), Magik, Kitty Pryde, Magneto, and Dazzler.
Students: Fabio Medina, Benjamin Deeds, Eva Bell, Christopher Muse, Jean Grey, Warren Worthington III, Hank McCoy, Bobby Drake, and Laura Kinney.