As cave exploration became more popular and speleology developed as an academic discipline, cave explorers were drawn into a problematic European nationalism.

New findings shed light on how humans' ancestors interbred, but the Denisovans remain quite mysterious.

The Cave of Crystals is a massive cavern, filled with gigantic gypsum crystals, larger than any crystals ever before seen on Earth.

Neanderthals, suggest recent studies, had complex societies and even some culture.