This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

This singular art museum in São Paulo is unique inside and out.

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

A sculpture park that takes the use of clay to a whole new level.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

Nikola Tesla's former home contains an homage hidden from plain sight.

Spend the night inside a two-story elephant villa.

Twelve hundred stone carvings guard this off-the-beaten-path Buddhist temple.

Looking for the train station? Try the building shaped like a train.

A plaque honors Miami's sister city in the Canary Islands, inviting one to reflect on their place in the world.

An unexpected ghost village lurks on the southeast coast of Tenerife.

The quintessential Japanese rock garden has existed for more than 500 years.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

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

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

A bookstore dedicated to the intersection of comedy and art.

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

One of Europe's largest supercomputers is housed inside of a disused chapel.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.