The world-record holder for the longest bridge stretching continuously over water.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

Ancient cave tombs known as the "houses of fairies."

This massive rock balanced for thousands of years being tossed here during a volcanic eruption.

Hidden in a high mountain cave, this hermitage dates back to the ninth century.

A Roman temple perched over an Italian town, forgotten several times over.

A Roman calendar dating to the first century is tucked away in a small town alley.

Geometry and mystery come together in an epic show of octagonal masonry.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

Beautiful views and Roman-style statues on the Italian coast.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

A sulfuric hellscape in southern Italy.

The secret medieval communication system will whisk your words above the noise of the crowd.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Southern Italy's spinning top village.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

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

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

These medieval skyscrapers dominate the skyline of this small Tuscan town.