The first piece of public art dedicated to LGBT rights.

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

The most confusing clock in New York.

Salute the leader of the proletariat.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Unrepaired walls from a 1920 anarchist bomb attack.

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

Cryptic messages embedded in the New York City sidewalk.

Plot your trip through the city on the sidewalk.

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.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

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

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A celebration of capitalism in Midtown.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

A dilapidated dock tells the story of Titanic's missed arrival.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

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.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

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

An old vending machine serves up unpredictable beverages from its seemingly magical insides.