Appearances can be deceiving, even in some of the world's most well-known buildings, stately homes and global landmarks. But if you know where to look, there's a treasure trove of secret passageways hiding in plain sight, facilitating sanctuary, escape and more curious goings-on. 

From Capitol Hill and London's House of Commons to the Palace of Versailles, Dracula’s Transylvanian castle and El Chapo's covert safe house, click or scroll on to discover the world’s most incredible hidden passages and tunnels.