Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A multi-storied adobe complex has been inhabited for more than a thousand years.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Legend says this rock was once a chopping block for public executions.

A grave marker depicting a body snatching tableau on a 19th-century tombstone.

A six-ton wedding present for the King of the Scots.

The most loyal of little dogs, or a Victorian era publicity stunt?

The final resting place of soldiers' loyal canine companions.

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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This gorgeous space is England's largest independent library outside of London.

2300-year-old Roman road connecting the empire.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

The most visited, and possibly most controversial, museum in Germany.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The conquistador's former fortress is the oldest preserved colonial building in the Americas.