A semi-scholarly approach to sex.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The oldest operating pharmacy in the world features 800-year-old recipes.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

Traveling collection of amazing automata.

Museum of amazing old toys and automata.

Inside a former cabaret, seven floors of erotic art.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

France's national museum of scientific and industrial instruments.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The celebrated eyesore created by starry-eyed sweethearts.

A unique sculpture park that specializes in the huge and bizarre.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.