This hilarious English intersection is an automotive whirlpool.

Europe's largest prehistoric mound – burial site of a legendary king?

The largest stone circle in the world has ended up bringing up more questions than it has answered.

This restaurant's specialty is "a major enigma for food historians."

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Constructed from recycled wrought iron railroad tracks, it's been described as the most beautiful seaside pier in England.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This statue is the only female representation of Rome's "talking statues."

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A Nesting Doll of Churches.

Rome’s legendary peephole vista is also a former Crusader stronghold.

2300-year-old Roman road connecting the empire.

Jesus' footprints and the first catacombs in the world.

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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A sculpture serving as an homage to Pope John Paul II.

An alchemist's “magic door” stands in the middle of a Roman park.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.