2 tips.
Cave of Lascaux near Montignac
Well, you're partly right. The Cave of Lascaux was discovered in 1940 by 4 teenagers, and it was closed to the public…Ice cave in Chamonix
Yeees, Grotte de la Mer de Glace, super ice cave that has been carved every spring since 1946 in Chamonix...That's…