Before becoming a public park, this spot was a shell midden, a fort, and an amusement park.

A museum of unusual collections, mini-towns, and a half-dog, half-alligator.

No one really knows how these old hobby horses got here, but the herd keeps growing.

This woodland architectural installation acts as a camera obscura for the heavens.

Pennsylvania's own Roswell-style UFO mystery.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A former utopian healing center created by a huckster and built by derelicts.

Less a museum than a bizarre fantasy world created by artists and engineers.

A museum dedicated to the mysterious cryptid.

The legend of a local monster still haunts this small town.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

A park full of outsider art, created by college students studying outsider art.

This rare symbol of Eastern philosophy in the West has been created over years of painstaking construction by the local community.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The site of Paul Revere's historic two lantern warning.

An enormous, inside-out glass globe built in 1935.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

This exhibit is one of the largest and most well-preserved collections of Jurassic-era trackways in the United States.

The world's longest known cave system.

This granite rock face is named for the magnificent reflection that occurs when the sun hits it just right.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.