Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

While exploring the desert, you can stop by the home of a fictional heretic from a parallel universe.

A hands-off space for graffiti artists to hone and display their skills.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

Zurich's evolution museum hosts a unique collection of skeletons among its natural history treasures.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

The library's graceful rotunda is like a bibliophile's temple.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

Where the leftovers of love affairs can live on forever.

A meditative space out of a fantasy story.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A huge cathedral single-handedly constructed by one eccentric monk.

The prolific artwork of a self-taught sculptor.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Commonly acknowledged as the only public monument to the Devil himself.

The earliest known map to show America, discovered by accident at a Paris bookshop.