No shoes allowed on this trail, which is designed to be experienced barefoot.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This abandoned Belgian fortress is purposefully being left to nature.

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

Rediscovered in 1992, this abandoned medieval village once flourished by fishing and piracy.

A taxus-tree to which Julius Caesar reputedly tied his horse.

The foundations of a forgotten fortress, wedged in between two streams.

The private train station King Leopold II built for the Belgian royal family now lies abandoned.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

Hiding the longest subterranean river known in the world.

Stocking up on the world's best beer requires a pilgrimage to a monastery drive-through.

This museum is filled with an eclectic collection of unique inventions.

A museum celebrating the Canadian forces that liberated Belgium from the Nazis replete with battlefield miniatures and multiple Gardens.

An unsettling sculpture of a boy hanging out in a street in Ghent has been baffling visitors for years.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

A wunderkammer of exoticism immortalized by Tom Waits.

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Hidden in plain sight on a gable between two towers on the roof of shipping firm F. Laeisz' headquarter in Hamburg sits an unexpected bronze sculpture.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.