A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

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

The world's tallest bridge is also possibly the most elegant.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

A Gothic cathedral created from volcanic rocks.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Mysterious hillside with a continuously burning natural fire.

A century-long search for a church that was never there.

The oldest trees in Northern Germany.

After years of being casually peed on by humans, this tree is peeing back.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

The world's oldest rose is so tough it survived being bombed in World War II.

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

A striking 12th-century-style castle built on the edge of a cliff.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

This "floating railway" is one of the world's oldest monorail systems.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

Living trees form the structure of an open-air palace.