A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

World Trade Center memorial likened to a woman's sexual organ.

Step inside Lucy, the world's largest "elephant."

A historical home in upstate New York honors the work of John W. Jones, a formerly enslaved man who was a major agent for the Underground Railroad.

A 10-foot-tall concrete Alley Oop statue left over from World War II now stands on the side of the road.

This sprawling taxidermy collection celebrates the art and history of sport hunting.

As telephones become more essential and less stylish one historic Brooklyn building remembers the days when they were a grand celebration of communication.

Here be dragons.

This private island is still in the family after a 400-year history including a witch hunt and a pirate.

Depression-era fun lives on in this Harlem museum dedicated to the sport of the street.

The legendary court where emerging basketball players gain their street cred.

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

Every animal in the torah taxidermied and crammed into a Brooklyn townhouse.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

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

A hands-on traveling collection of the innovative devices of yesteryear.

A hulking remnant of Alaska's industrial gold mining boom in the 1920s.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

Gorgeous cave resemble a winter wonderland.