The inscribed stone at Kilnasaggart is a remnant from nearly a millennium ago.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

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

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

Charnel house at the foot of Mount Sinai.

Ancient Egyptian relief, claimed to depict an electrical light.

The largest known Ancient Egyptian obelisk.

A "miracle" that seems to produce more holy fistfights than holy revelations.

The home of the Dead Sea Scrolls is an abstract modernist dream.

Travel deep inside of Europe's second largest glacier in the world's largest man-made ice cave.

An isolated, rusty phone booth commemorates Iceland's first international telegraph cable.

This replica Viking village was created for a film that was never shot and is now open to visitors.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

One of Ireland's most infamous prisons for rebels including men, women and children.