An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

Rome's ancient Etruscan rival, now a park full of ruins.

Gods clash with machines in a power plant regenerated as a museum.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

A fairy tale castle in modern Rome.

A Nesting Doll of Churches.

Jesus' footprints and the first catacombs in the world.

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

An extensive collection of fine art devoted to man's best friend.

Five acres of divinely inspired folk art.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

In the town of Åtvidaberg, the midday sun sets off a loud cannon boom.

This quaint museum tells about more than just the birth of Jesus: "betlémy" are an important piece of Czech history.

One of the last free public hot springs is decorated with hippie art.

The summer tourists on these cliffs are thousands of seabirds.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.