An enormous, inside-out glass globe built in 1935.

All that remains of the former site of the final home of president Franklin Pierce.

A real-life hidden Easter Egg in New Hampshire's capital city

Carved, egg-shaped stone with no explanation.

A gas station and a state sign commemorating the most famous claims of extraterrestrial abduction.

Even Henry David Thoreau found this glacial pothole irresistible.

The Old Man of the Mountain’s less-famous, but still beloved little brother is said to resemble a leader of the Abenaki tribe.

This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

This impressive Boston holy house is the American mecca for Christian scientists.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

A layered tribute to the work of mosaicist Isaiah Zagar.

The world’s first penitentiary, meant to be humane, drove men insane.

Yo, Adrian!

A park full of outsider art, created by college students studying outsider art.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A field of nothing but boulders which resembles a giant's gravel driveway.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

Whimsical artist house in the New Jersey woods.