8. Lascaux Caves
Situated in South of France, these Paleolithic cave paintings are believed to be over 20,000 years old. They contain 900 of the most perfect surviving examples of Upper Paleolithic art. These paintings are mostly of animals. An 18-year-old, young man named, Marcel Ravidat discovered the entrance of Lascaux Cave, on September 12, 1940. Surprised by his discovery, Ravidat came back to this place along with his three friends on a self-prepared shaft. Once they explored the caves, the teenagers found out that the cave walls were carved with depictions of animals.
On their return, they informed the local authorities about their discovery; after years of exploration, the cave was opened for public in the year 1948. Soon it was observed that the exhaled CO2 from visitors, visibly damaged the painting thus the tourism was stopped and caves have been closed since 1963. Also, have been menaced in recent years by a series of unexplained, and only partially controlled, fungal invasions. Any human presence in the caves is regarded as potentially destructive. Normally, they are entered only once a week by one security guard for a few minutes at a time.
It is declared as a UNESCO world heritage site now and only hand few of scientist are allowed to visit it.