A museum of magic with a Sadist past.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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.

Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

Natural rock water slides hidden in the remote forests of northern Idaho.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

Four abandoned towers hidden above the Douglas fir forest in Washington.

The southernmost outpost of the Russian Empire in colonial America.

The decaying remains of a once-luxurious Soviet spa town.

A secret climbing tree hides along the side of a Costa Rican road.

Rare recess caves fill this unbelievably beautiful Ohio park.

You can row a boat through this ancient underground reservoir.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

A blacklight mini-golf fever dream pays tribute to the iconic rock band.

One of Belgium's oldest hospitals saw patients from the 13th to 20th centuries before becoming a museum.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

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

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.