One person's lost luggage is another person's treasure.

Take a drunken tour inside the world's largest known geode.

Mysterious rocks that ring musically when struck.

Enormous lake at the bottom of a unique cave system.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This secluded walking trail is a hidden gem of a Pittsburgh park.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

A serene temple with stunning stained glass hides in downtown Dallas.

This downtown Dallas art installation is always on the lookout.

An enormous overgrown greenhouse teeming with graffiti and wildlife.

A "Bugseum" dedicated to all things insect-related resides behind a pest control company.

Destructive children, start your engines.

Eighteen miniature death-scene dioramas.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

Remnants of a storybook amusement park hidden behind a strip mall.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

Brain collection and database that narrows the gap between man and animal.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.