This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This collection of solar timekeepers includes the world's first digital sundial.

This bike path traverses the treetops.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

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

Replicas of fossils unearthed during renovation work reveal how this area would have looked millions of years ago.

Although resembling a grand Buddhist temple, this structure is actually the largest mosque in China.

This interactive sculpture allows visitors to leave a message in case a friend passes by.

The last Oostende trawler to fish off Iceland is now a museum.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

A rare example of World War I trenches from the British front.

This heavily worn bas-relief was once an honored fertility symbol.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

This massive blockhead sculpture hides an entire library.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

The unexpectedly beloved remnants of a controversial thermal power plant.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

For over 300 years this little carving has been the city’s good luck charm.

This mountain trail inspired Nietzsche to complete his magnum opus.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.