Former utopian colony based on the belief that the universe exists in a hollow sphere.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

Mysterious stone tower featured in many alternative histories of the New World.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

This 50-foot rock formation looked like a face that was once believed to be that of a Native American chief.

Haunted boulder in a front yard with a witch painted on it.

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

Eclectic collections, artwork, and some feline friends fill the writer's former home.

This lakeside tower is the third attempt at getting a tourist destination to stick on the spot.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

World's first "penitentiary," meant to be humane, drove men insane.

The ghostly remains of an accidental sea.

A hand-built folk art installation covered with messages of God's love.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A geological mystery on Camelback Mountain.

A house built from trash known as the poor man's Hearst Castle.

A massive volcanic plug is now a protected area that hosts a number of bird species.

A hotel and restaurant serving as the mecca of kitsch.

An alley covered with 20 years of bubble gum.

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

An unreal vintage shop that wears its dadaist influence on its zombie fish.

A glittering South Asian anomaly in a wealthy Los Angeles suburb.

America's most famous piece of self-built architecture.