A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

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."