This tiny patch of arid sand sits in one of the greenest states in the United States.

In the 19th century, this canal provided power to mills, machine shops, and other businesses in the area.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The real-life site of Ichabod Crane's infamous gourd attack.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This throwback amusement park is home to rides and unique storybook figures from the past.

A mysterious echo seems to defy the laws of acoustics.

Designed as a place for patients to take in the scenery, this tower has a dark history.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

America's oldest archaeological site or a muddled case of wishful thinking.

Mysterious rocks that ring musically when struck.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.

This abandoned train tunnel has been the subject of countless ghost stories for years.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The whole world in one water tank.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

The first dish to bounce radio signals off the Moon, it was the forerunner to the U.S. Space Program.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.

A world-class collection of mechanical musical instruments and automata.