Famous bunkers include the World War II V-weapon buildings in Germany ( e.g. , Mittelwerk , La Coupole , and Ã perlecques ) and the Cold War buildings in the United States ( Cheyenne Mountain , Site R , and The Greenbrier ) and Canada ( Diefenbunker ) . Famous bunkers include the post-World War I Maginot Line on the French eastern border and Czechoslovak border fortifications mainly on the northern Czech border facing Germany ( but to lesser extent all around ) , Fort Eben-Emael in Belgium , World War II FÃ 1\/4 hrerbunker , the V-weapon installations in Germany ( Mittelwerk ) & France ( e.g. La Coupole , and Le Blockhaus ) and the Cold War installations in the United States ( Cheyenne Mountain , Site R , and The Greenbrier ) , United Kingdom ( Burlington ) and Canada ( Diefenbunker ) .