The most common museums about caves are replicas of painted cave. That's because painted caves are quite fragile. The paintings, drawn by our Stone Age ancestors, survived up to 40,000 years, and are now in danger to be destroyed during a few years of cave tourism. In this case its not something like vandalism, the breathing of the visitors changes the cave air, the heat of the bodies changes the temperature, plant seeds in the clothes of the visitors start to grow in the light of the electric lamps. The result is total destruction in a few years.