ALTAMIRA, Spain — The cave of Altamira in northern Spain contains some of the world’s finest examples of Paleolithic art. For years, visitors came to see the bisons, horses and mysterious signs painted and carved into the limestone as far back as 22,000 years ago. But in 2002 the cave was closed to the public when algae-like mold started to appear on some paintings. The damage was attributed to the presence of visitors and the use of artificial light to help them see the works.
Now Altamira is being partially reopened and in the process reviving the debate over whether such a prehistoric site can withstand the presence of modern-day visitors. Read more.