The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

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

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.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

An office built to look like a giant basket.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Dramatic river bend surrounds a natural red-rocked pedestal.

A tunnel with windows, so you don't miss out on the impressive views.

This balancing rock is one of Utah's most unusual geological formations.

This vintage theme park is peak Christmas kitsch—and it's open all summer.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

The oldest continuously occupied public building in the United States.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.