This curious, round temple is the oldest still-standing marble building in Rome.

This lake was sacred to the Sabine people who constructed a temple here on a floating island.

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

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

A brutalist gem towering over the heart of Milan.

Since the 1960s, this small village has invited painters to decorate its walls.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

This network of roads is one of the most unique Etruscan creations ever discovered.

This long-abandoned village sits across a narrow gorge from a still-inhabited settlement that was once its twin.

This Roman underground canal was the longest tunnel ever built until the late 19th-century.

In Lago Superiore, the largest expanse of lotus flowers outside of Asia is hard to miss.

A floating bridge leaning on barges allows pedestrians to reach the historical center.

Though an earthquake destroyed this village in 1980, one former resident still walks its streets every day.

Built as a defensive structure, this medieval walkway road offers a unique view of the village of Brisighella.

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

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

This sturdy, circular stronghold served as one of the forts that protected the Venetian Lagoon.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

These delicate sand pyramids look like naturally occurring gothic spires.