A short walk downhill from the real cave is the first reproduction, duplicated and molded in concrete to look and feel like the original stone. The 39m-long (128-ft.) tunnel faithfully reproduces the section of the cave harboring 90 percent of the famous paintings, so you will get a good idea of what the “Sistine Chapel of Prehistory” looks like. You’ll see majestic bulls, ibex, stags, horses, and deer, the originals of which were painted by Cro-Magnon peoples 15,000 to 20,000 years ago. No one has yet figured out exactly what purpose these paintings served, but the artistry of these prehistoric painters is startling.