An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

One of the smallest bookstores on the planet.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

This giant sculpture made of trash is a critique of society's wastefulness.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A hidden three-foot-wide house separates these two regal churches.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

A gothic church dedicated to the love of wine.

A Christian retreat founded to welcome refugees fleeing from the Nazis during World War II.

These colorful French islands spent a stint bootlegging booze during American Prohibition.

A small town hallucinates en masse - Bad bread, or CIA science project?

This building’s ghostly exterior reflects its former lives as a prison, school, and funeral home.

For those late-night mollusk cravings.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

This tiny hotel perched atop a 50-foot tower really puts things into perspective.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.