The remains of this ancient fortress atop a manmade hill look as though they were built into a volcano.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

This Scottish burial tomb once held hundreds of ancient eagle bones.

A magnificent, iconic stone tower in the Scottish Highlands.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."