Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

This picturesque mansion has gone from opulent ruin to nature museum.

A tourist attraction founded around a slumping cabin.

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

Museum showcases Japanese sexuality and some amazing ocean views.

Tubing through a cave lit with glowworms is a magical underground experience.

This mysterious hill seems to pull objects uphill.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

One of only two remaining Victorian-era greenhouses in New York.

Abandoned power station once home to a squatter community, now being developed into an arts center.

A huge resale shop for the cast-offs of the film & television industry.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Sniff the Titan Arum's rotting flesh.

Hollowed out cedar log tubs set in an ancient towering forest.

Massive crater in central Oregon.

Gigantic private toy museum featuring among finest collections of antique mechanical banks in existence.

These machines have been collecting dust for decades.

An emporium for the weird, creepy, rare, and just plain gross.

Delightful disarray of found objects and clutter.

Check out the underground party scene at the "Burning Man of Brooklyn."

The remains of diamond fever taken over by the desert.

The Voodoo Superstore of the world.