The Cuevas de los Tayos is one of the longest cave systems in South America and remained unexplored for a half-century after the first reports of its existence in 1860
Speleologists collected information on 186 caves and chasms but there are many more on land and in the sea
NASA: "Titan is the only world outside the Earth where we see bodies of liquid on the surface"
The Dead Sea Scrolls consist of the remains of 900 manuscripts found in 12 caves located near Qumran
Europe was considered to be the location where the oldest figurative art first appeared
From the historic cave of the "Papanikolis" submarine to the Ortholithos, it's sights you will not forget
The MoD said it had ‘no information’ on the caves...