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

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Hundreds of preserved dinosaur footprints can be found along a hiking trail in this small village.

The world's only museum devoted to the wonders of fluorescence.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

A curious collection dedicated to human and animal anatomy and pathology.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A stone structure built thousands of years ago on the Iberian peninsula.

An ancient stone structure that, according to legend, was built by witches.

The spectacular geological formations make it one of the most impressive caves in Europe.

Hidden underground, a remarkable 10th-century bath complex survives virtually unaltered.

To fit bodies into this Renaissance crypt, they were first left to decompose in the crypt's rotting room.