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The caves are comprised of three main caverns: the Chapel (La Capilla), the Cathedral (El Catedral), and the Cave (La Cueva). Visitors to the caves can explore them in a small boat or kayak, but only when Carrera Lake’s waters are calm and gentle.

Melissani Cave, Kefalonia, Ionian Islands, Greece

Predil Lake, Friuli-Venezia Giulia, Italy

Slovenian Caves - the Grand Canyon that is underground

The main nave of the basilica at Jasna Góra Monastery in Częstochowa, Poland ( by arjuna_zbycho)

Peterborough Cathedral dates from the 10th century, Lincolnshire, England