To some, Easter Island is just a tiny bit of volcanic rock in the middle of the Pacific Ocean. To others, it is the source of one of mankind's greatest mysteries. Easter Island is home to hundreds of giant statues that people built centuries ago—but no one knows why. The statues are amazing. Some of them wear headdresses made from red stone. Others have large pieces of coral for eyes. Almost as mysterious as the statues themselves is the fact that so many of them were never finished. In fact, tools used to make the huge stone structures were left right near the unfinished works. What happened on Easter Island? And why does it continue to captivate us?