This historic stone bridge has an entire neighborhood clinging to its sides.

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

An intricate and amazing house built by architect Karl Junker.

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

When the rain falls, this drain system turns into a musical instrument.

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

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

The ghostly remains of an accidental sea.

Version of the French Riviera destroyed by the sea.

Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

An antique curios dealer and hybrid taxidermist.

Dedicated to the history and culture of smoking, this small museum now includes a vape lounge.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The largest medical and anatomical collection in France lies hidden from the public.

The history of radiation is on safe display at the foot of a radiation science laboratory.

A unrivaled and rather horrifying collection of wax dermatological models.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.