An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Walk in the footsteps of the gods and straddle two tectonic plates.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

The center of the only hemisphere that awards visitors with a commemorative coin.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

The "dragon babies" of southeastern Europe.

The Origin of On the Origin of Species.

Remote, volcanic island that Darwin, Hooker, and the Royal Navy shaped into a thriving, artificial ecosystem.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

As its grandiose name implies, this wooden dome is unsurpassed in size.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Home to secret Eastern Bloc spy equipment and the largest stretch of the original Berlin Wall outside of Germany.

Mysterious lost empire of the Silk Road.

A cruise ship retraces the the route of the doomed RMS Titanic, 100 years later.

A fantastic castle rumored to be the birthplace of King Arthur.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.