Nicknamed the "Spirit of Paul Klee," this colorful apartment building features an array of multicolored panels.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

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

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

This mansion oasis contains gardens, sculptures, and fountains just off the busy Plaça Kennedy in Sant Gervasi.

An open-air "garden" of mural art that changes weekly.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

This Funeral Hearse Museum represents the finest in cadaver transportation.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This museum houses an imposing skeleton army comprised of creatures great and small.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

The first green space constructed on an elevated viaduct.

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

A museum of magic with a Sadist past.

This Parisian café sticks almost exclusively to an ethos of reuse.

Notorious artist squat renovated into legal studios.

Claude Monet was baptized in this lavishly ornate Paris church.

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

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

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

This Parisian gem is one of the most incredible ethnographic museums in the world.