The Cave of Niaux is the headline act of the Ariège valley. Around 14,000 years ago, Magdalenian artists walked deep into the limestone to paint bison, horses, ibex, and a single fish on the walls of a chamber known as the Salon Noir. The drawings are extraordinary — confident black outlines that capture muscle, motion, and species with a few quick strokes.
Niaux is one of the very few major decorated caves in Europe still open to the public. Numbers are strictly limited and visits must be booked well in advance, particularly in summer. Tours run in French; English-language slots are rarer and worth chasing. The walk in is long, cold, and uneven, so bring sturdy shoes and a warm layer even on a hot day.