Explore the historical significance and unique natural wonders of Gibraltar as your guide introduces you to some of its most famous landmarks. In prehistoric St. Michael's Cave, see magnificent stalagmite and stalactite formations; in the Upper Galleries, discover the origins on tunnelling in Gibraltar during the Great Siege. Walk through narrow tunnels hollowed out by British troops; and, at Apes Den, delight in the mischievous antics of the Barbary Apes who make Gibraltar their home.