But Cosquer cave is also entirely unique for another reason – it has just one entrance, and that entrance is deep underwater. So, how did the paintings get there, and why is this cave so special?

Eagle-eyed Reddit users have spotted what appears to be an underwater cave built into the side of Hogwarts in concept art for the upcoming Harry Potter game Hogwarts Legacy. Reddit user BNS ...

The underwater caves of the Yucatán Peninsula ... Also rare sightings for cave explorers are sophisticated Maya paintings on cave walls close to the entrances of cenotes. Depicting wars, animals ...