Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

A family accused of witchcraft once called this medieval tower home.

This work of engineering is imbued with elegance and ingeniousness.

Gladiators once walked this ancient, subterranean passage.

This former mill comes to life during the Christmas season.

What appears to be an ancient Roman temple is actually a Catholic church.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

This Roman amphitheatre was also the location of the first gladiator school.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

The sacristy of this church contains remains and relics of members of the Aragonese royal family.

Richard Luke Concanen never set foot on American soil.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

The relics of dozens of martyrs are stored in a single chapel.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Ancient snack bar of the Roman Empire re-opened.

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

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

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

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.