Cape Citadel

Building · Earth · position approximate (fictional or vague in the sources)

Comics

Silver Recruited by Professor X after helping his parents escape the Conquistador, Hank joins the first class of X-Men as the Beast and fights Magneto at Cape Citadel. (Beast (Dr. Henry 'Hank' McCoy), permalink)
Silver As a founding student of Xavier's school, Bobby helps the first X-Men drive Magneto from the Cape Citadel missile base. (Iceman, permalink)
Silver Xavier gathers his first five students at his Westchester school and sends them against Magneto, who has seized a military base at Cape Citadel. (Professor X, permalink)
Silver As the Angel, he joins Charles Xavier's first class of X-Men and fights Magneto at the Cape Citadel missile base. (Angel (Warren Worthington III), permalink)