This shop for all your super spy needs hides an educational secret.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Elevated freight railway turned wildly successful urban park.

The fairy tale castle of the "fairy-tale king."

Try not to get slimed in Tribeca.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The legendary building that needed ghostly approval before being built.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An enormous, inside-out glass globe built in 1935.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

A magical place that lets you play in and explore the world of Studio Ghibli.

A kaleidoscopic warehouse-maze of handmade neon signs.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Taoism, Buddhist and Confucianism are all represented in this temple that claims to answer anyone's wishes.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

Climb to the top of the world's largest seated bronze Buddha.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

This hulking behemoth is actually five interconnected towers built in the 1960s.

The world's largest statue of Mao Zedong looks out over the city where he discovered Communism.

A golden temple atop a sacred mountain, known for its giant effigy of the revered Pu Xian.