Two stone columns flank the grand Venice square, but there were supposed to be three.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Go inside to really appreciate this 500-year-old technological masterpiece.

The walls and streets of the ancient city are peppered with penises.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Spanning over 10,000 square miles, this ancient salt pan is one of the largest on the planet.

There is only one place in the world where the corners of four nations come together.

An enchanting rocky island of scraggly baobabs surrounded by an ancient sea and sprawling salt pans.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

A former suicide bridge is now accumulating symbols of love instead of a body count.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Sweden's "good old days" painstakingly re-created in a model village.

Stockholm's deepest subway station is also a stunning ecological wonder.

Ancient snack bar of the Roman Empire re-opened.

2300-year-old Roman road connecting the empire.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.