This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

Perfume museum and library.

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

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

This massive library holds what was once the largest book collection in the world.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

BDSM, 1930s Style.

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

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

Inside a former cabaret, seven floors of erotic art.

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

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

The somewhat misnamed 'Garden of Shells' lovingly built from found objects.

This abandoned Belgian fortress is purposefully being left to nature.

This ghost town in Belgium will lose its street art when it ceases to exist.

Cozy basement bar sports an inventory of over 2,000 beers.

This modern arts center is built around a gem of late-Baroque architecture.

The Devil’s own choice when he needs a drink in Brussels.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Hungarian self-built castle.

Hungarian mummies in beautiful painted coffins.

Budapest's Communist-era statues, banished to the suburbs.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.