This 5,000-year-old tomb once had its own hinged door.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

This megalithic tomb was crafted by a mysterious civilization that settled the island of Pantelleria.

This Bronze Age tomb makes the most unusual front garden fixture.

At this unique farm, you can interact with adorable donkeys and view an ancient dolmen.

This former Union fort commands a fine view of downtown Cape Girardeau and the Mississippi River.

A fantastic castle rumored to be the birthplace of King Arthur.

This medieval manor house was hastily fortified when it found itself in the middle of the Scottish fight for independence.

The site of the first medieval crusade that pitted Christians against Christians.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

This ancient burial mound is accessed by an impressive Greek-built archway.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

This ceremonial mound is one of the first officially recognized Native American historical sites in North Carolina.

This state park was once an important Native American cermonial center.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

In legend, this ancient dolmen was said to have been created when a troll tried to destroy a church.

A collection of huge Pre-Colombian structures in Alabama.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

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

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Stonehenge has nothing on Castlerigg’s views.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.