The first park built over a freeway is a brutalist masterwork.

This former coal gasification plant found a curious second life as a popular public park.

A wall of chewing gum moonlights as collective art.

A colorful architectural gem in Seattle's uniquely modern Central Library.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Ride the subways of yesteryear.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Try not to get slimed in Tribeca.

A collaborative art project that transformed a neighborhood in NYC's Queens.

Elevated freight railway turned wildly successful urban park.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A hip bar decorated with walls of golden skulls.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

A quick trip around the globe through an amazing miniature exhibit.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The most confusing clock in New York.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

A crumbling hospital from the 1850s on Roosevelt Island.

A modern addition to the Greenpoint skyline.