Once a kitschy symbol for a gift shop, this 38-foot seahorse is now a staple roadside attraction.

A castle on a hill once named "the most beautiful high school in Massachusetts."

The quirky salon doubles as a retro museum run by the world's leading "hairstorian."

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

Funded entirely by volunteers and donors this military memorial features a tank with a comedy line on its barrel.

The home of a famed utopian science fiction author has been preserved long after his predicted future in the year 2000.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

This donated headstone marks the grave of a pair of elderly women who were mysteriously murdered.

A unique music museum housed in a historic Boston theater.

This impressive Boston holy house is the American mecca for Christian scientists.

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

Located in a beautifully restored ice house, this museum is the result of decades of hard work and devotion to the craft of plumbing.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

A mysterious stone embedded at the base of a historic Boston building.

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

Founded by the famed children's book artist, this museum spreads an appreciation of the arts through picture books.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

Painstakingly built dioramas sit unnoticed in a Boston office building.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.