A museum of magic with a Sadist past.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

A museum of carnival attractions where you are invited to ride the rides.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

The largest salt farm in the Canary Islands is located at the foot of an active volcano.

You can soak in three relaxing pools filled daily by the tide.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

This once rural mansion now sits in the heart of the city.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Shrapnel scars and bullet holes from the Spanish Civil War can still be seen in this monument to Spanish doctor Federico Rubio.

The morbid items in this small and hidden museum are not for the weak stomached.

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

King Carlos IV laid the first stone during construction of this chapel.

A quaint amusement park now sits, rusting and forgotten among the foliage.

This glass-themed tourist park in northern Japan feels like taking a step back in time.