The actual cave has been closed since 1963 to prevent further deterioration of the paintings from too many human visitors. Since 2016, an above ground [entry] museum, LASCAUX IV, that does an excellent job of duplicating the actual cave has opened in near proximity. Recommended!
7. ULURU (FORMERLY AYERS ROCK) [Australia]
You CAN VISIT but climbing to the top of this 335 meter / 1,099 feet sandstone monolith is no longer permitted. You can circumnavigate the 10 kilometer / 6.2 mile base (need lots of water).