The ominously named cave is home to some remarkable ancient art.

The largest stone moai on Rapa Nui.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

One of the largest squares in Europe contains an entire artificial island.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Ancient snack bar of the Roman Empire re-opened.

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

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Pilgrimage site for star-crossed lovers.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

The middle finger of modernity.

Architectureal fantasy quarter of Rome.

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

A 16th-century horror show built in a lovely Italian garden.

A symbol of hope, survival, and national character, especially after it rose phoenix like from the flames.

Home to more than 13,000 pieces of war memorabilia and military equipment.

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.