Researchers found numerous ring-like structures inside France's Bruniquel Cave. They believe they were built by Neanderthals some 176,000 years ago. Etienne FABRE - SSAC hide caption
ancient ruins ancient ruins
Researchers found numerous ring-like structures inside France's Bruniquel Cave. They believe they were built by Neanderthals some 176,000 years ago. Etienne FABRE - SSAC hide caption
Tourists at Persepolis marvel at the grandeur of a bygone age amid worries about the future. Steve Inskeep/NPR hide caption