The mountaintop inspiration for Umberto Eco's "The Name of the Rose."

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

This building has a giant piercing through one of its corners.

This sinister Baroque entryway could lead you to a terrible fate.

Abandoned hangar from a forgotten part of aviation history, along the Ticino River in Lombardy.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

This building features dozens of faces along its facade, although one is a bit chilling.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

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

This whimsical fountain depicts a winged siren shooting water out of her nipples into the fires of Mount Vesuvius.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

Locals pay their respects at a shrine to soccer player Diego Maradona—which claims to contain a real lock of his hair.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

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

These bronze horses on the gates of the Royal Palace of Naples were a gift from a Russian tsar.

This medieval city gate is now a blend of the past and the modern world.

A permanent exhibition honors Queen, which recorded seven albums at the casino-based studio, including “Under Pressure” with David Bowie.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

A Swiss board game museum housed inside a picture-perfect castle.

This statue of an everyday cleaning tool sits proud upon a plinth in Manchester's coolest quarter.