This cavernous abandoned marble mine is popular with ice skaters in the winter.

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

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

The first American axe throwing club.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

This ambitious father and son team reigned supreme over the North End, and witches, for many years.

An 80-year-old house built out of newspapers.

Massachusetts memorial to murder victim Elizabeth Short near the spot where she was born.

The massive machine creates cracking displays of indoor lightning.

The Mysterious Witch Bonney, a haunted statue in an old industrial city.

The oldest living cultivated fruit tree in North America.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

A 60-room castle constructed by a horse-racing heir.

Enjoy egg rolls and live music in a converted bank vault.

The first newspaper printed by an expeditionary force was published in this colonial mansion.

The widow of Benjamin Franklin's brother became the first female newspaper editor in the United States.

A plaque marks the spot on the bridge where one of the first elephants in the U.S., Little Bet, was gunned down.

This blue behemoth of a bear is a colorful homage to Brown University's mascot.