A pig barn converted into one of the most eclectic residences in Nantucket.

This little-known rival to the Library of Congress houses one of the largest collections of pre-1876 American books, newspapers, and manuscripts.

Memorial to a beloved puppeteer as well as all street performers.

More than 200 unconventional musical instruments that anyone can play.

The Burnside Fountain and its questionable interpretation.

This delicate museum is devoted to the art and industry that once supported Cape Cod's oldest town.

A dollhouse full of taxidermy rodents, each one handcrafted and given a sordid past.

The Atlantis of Cape Cod reemerges during the lowest of tides.

A steampunk wonderland that preserves America's history of industrial innovation.

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

The pleasant woodland cemetery that has inspired more than its fair share of wild legends.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

One philanthropist's extensive collection of knick-knacks and curiosities is now a public museum of oddity.

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

Bouncing, delightful, mechanical art at the MIT Museum.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

Impossibly life-like natural history models created out of glass by a father and son.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

Trash escaped from a landfill to fill beaches with all kinds of treasure.

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

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.