A 13,000-year-old mastodon skeleton was found during the construction of a 19th-century New York mill.

Small rustic cabin nested in the mountains of Killington, Vermont.

Who is this marble man, perpetually creeping up the steps of his own mausoleum?

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

The world’s largest underground marble quarry is hiding in Vermont.

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

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

A beautiful multicolored mound formed by the mineral deposits of the Orenda Spring.

Fossilized sea bottom and lime quarry.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

A mysterious echo seems to defy the laws of acoustics.

Final resting place of the author who wrote the ghost story "The Turn of the Screw," and his brother, the Harvard doctor and paranormal investigator.

These etchings reveal the history of a long-gone quarantine site.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

Former abode of notable poet, complete with literary references and stories of ghosts.

Beautiful steampunk ghosts of early Massachusetts.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

One New Hampshire alleyway has become home to a public gallery of feline art.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

A historic bridge with a lovely acoustic anomaly.

An elaborate, hidden model train in the Needham Town Forest.

It was founded by Ralph Nader to educate the public about an often-maligned area of law.

Who knew the Devil's domain was a hot spot for tubing?

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.