A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A psychedelic labyrinth on the San Francisco bay.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

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

The most confusing clock in New York.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

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

Elevated freight railway turned wildly successful urban park.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

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