This railroad tunnel was once the longest in Massachusetts.

Once the largest gravity dam in the world.

The only surviving building of historic West Boylston, which was flooded to create the Wachusett Reservoir.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

Divinely-inspired village houses 6,000 dolls, plus strange and lovely outsider art.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

A piece of outsider public art accompanied by a strange urban legend.

A classic roadside attraction on Vermont's historic Route 5.

A former copper mine which became a truly unsuccessful prison.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Driftwood dinosaurs lurk within trees covered in a rainbow array of avian abodes.

A gardener's enduring labor of love is spread throughout a small Vermont town.

A parade of antique steeds offers a quirky ride through history.

Thousands of American timepieces on display in the former clock-making capital of the country.

The mansion home of author Edith Wharton.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

Unicorns, elephants, and bears, oh my!

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