A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

The site of the first battle of World War II.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

An archeological treasure trove stumbled upon by a couple of children.

A huge Megalithic chamber tomb located behind a cafe.

Ancient paintings known as the "Sistine Chapel of Cave Art."

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

A Neolithic burial site built 1,000 years before Stonehenge.

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

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

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.

Petrified footprints of one of the very first vertebrates to walk on land.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

A remarkably well preserved tower dating all the way back to the Iron Age.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.