Mount Rushmore: Contains a hidden chamber with historical documents behind Lincoln's head.
Taj Mahal: Features intricate underground rooms and secret passages closed to the public.
Statue of Liberty: Houses a restricted-access room inside the torch, closed since 1916.
Eiffel Tower: Hides a secret apartment designed by Gustave Eiffel for personal use and guests.
Great Wall of China: Contains hidden signal towers and secret military fortifications.
Colosseum: Features underground tunnels used for gladiator and animal transport during events.
Buckingham Palace: Contains secret doors and passages for the royal family’s discreet movements.
Machu Picchu: Has hidden temples and rooms still being discovered by archaeologists.