Famously misunderstood wonder of the ancient world

The oldest working mechanical clock in the world.

Quite simply the largest tree in the world (by volume).

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

The rocks in this arid basin leave trails of movement behind them.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A fortified city, home to a remaining population of five families

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Macabre astrological automaton clock dating to the late 1400s.

A naturally mummified 2,000-year-old man.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The final resting place of soldiers' loyal canine companions.

Protecting the dead from opportunistic body snatchers.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A sweet symbol marks the place where torturous executions were once carried out.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.