This 15th-century island fortress later served as home to the executioners no one wanted to live near.

The nuns here cultivate silk to weave some of the finest scarves in the world.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

Flying high over the small island of Zákynthos is a giant tribute to the mainland.

A solemn reminder of the infamous World War II war crime that massacred almost all the men in a small Greek town.

An islet filled with wooden houses where the open sea meets a lagoon.

Strange rumors surround the artist who created these solemn metal guard dogs.

Meet the oldest inhabitants of this Italian hamlet, a series of oddly preserved mummies.

This one-time health resort was used by aristocrats around the world.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

This 19th century cyclorama acts like an analogue time machine to a different era.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

The final resting place of the famed German pilot, the "Red Baron."

This tremendous timepiece was once the largest cuckoo clock in the world.

This disused boat elevator was saved from the scrap heap so that visitors could tour its rusting skeleton.

The tomb of a hard traveling saint is constantly covered in shoes as offerings to heal disabled youth.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

Designed in the Romanesque style, this structure was once a fortress monastery.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.