Stonehenge, a prehistoric monument located in Wiltshire, England, is one of the world's most well-known ancient religious and burial sites. Situated amidst a dense complex of Neolithic and Bronze Age monuments, the modest looking circle of stones that are visited by millions of tourists annually were declared a World Heritage Site in 1986. Now it appears that the ancient tombstones that are believed to date all the way back to 2,000 B.C. have some bigger competitors right in their own backyard.