For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

This unique house, the only one of its kind in Brooklyn, was built as part of a real estate developer's showcase.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

Detailed facade of a brownstone in Boerum Hill.

The oldest living tree in Manhattan comes shrouded in sinister legend.

This slender three-story building has also had several famous residents.

This two-room shotgun shack in Tupelo is the birthplace of a King.

An ancient cemetery with some historic bodies underfoot.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

A work of art that pays homage to a Victorian timepiece in Providence.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

Created by a local artist, these quirky sculptures each have their own names and personalities.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

A men’s restroom became a sandwich shop.

A beautiful Victorian-era cemetery, complete with a miniature village.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

Dim sum, served in a grand old theater.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

A gift to the children of Boston, this bronze bear represents playfulness, a spirit of love, and the warmth of big hugs.