A psychedelic labyrinth on the San Francisco bay.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

Volunteer-run library dedicated to exploring five decades of activism history.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

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

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

New York's oldest and possibly grandest keeper of books.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

A living archive of urban activism and space reclaimed.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

The "Seinfeld" diner.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A New York garbage depot holds a secret collection of weird and wonderful refuse.