The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Sniff the Titan Arum's rotting flesh.

One of only two commuter aerial tramways in the United States.

Read a book next to a Midtown waterfall.

Try not to get slimed in Tribeca.

Elevated freight railway turned wildly successful urban park.

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

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

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Pop culture has helped to keep this iconic British building from being destroyed.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This indiscriminate collection of audio antiques is trying to preserve the history of the audio industry one vintage appliance at a time.

From lefty Jewish gathering site to hip cultural site in just 80 years.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

One of downtown Berlin's last reminders of its Communist past.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This sublime architectural marvel is a rare example of an expressionist church.

Copenhagen's celebrated theme park and gardens.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

This expansive bridge in the Canadian wilderness was originally just built for friends.