A beautifully eclectic mix of architectural styles.

Amsterdam's former hotspot for public executions and dissections.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

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

A special area of the National Archaeological Museum of Naples is located inside a metro station.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

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

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

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

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

This French anatomy museum greets guests with a skinless man, mid-shovel.

A museum dedicated to the tragedy of Bloody Sunday.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

The first military air station in all of Ireland hosted "battlebags."

Whimsical woolen creatures have taken over this historic Northern Ireland park.

The artwork is a community's ode to the "father of Irish tourism."

A vibrant portrait celebrates the actress in her hometown.

This massive monument has been telling the time for 150 years—at a slight angle.

This giant sculpture is both loved and disliked by the local community.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.