Cuevas del Drach (Dragon Caves)
One of the most impressive caves on the island, the Cuevas del Drach are not to be missed. Spectacular stalactite formations and intricate canopies drip dramatically from the vaulted ceilings, while the guided tour descends 25 metres (82 feet) below the surface through four enormous interconnected chambers. The experience culminates with an atmospheric classical concert on the beautifully illuminated subterranean lake. Discovered in the late 19th century, Lake Martel is considered to be the largest underground body of water in Europe, and the opportunity to float across it on a little wooden rowboat is certainly a highlight of the hour-long trip.