This Florida sinkhole hides a rainforest-like micro-environment in its depths.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

This mansion turned restaurant was once a pitstop for Al Capone during his travels.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

More than five miles of underground passageways.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This little-known memorial honors those who have donated their bodies to medical training.

"Try not to knock anything over!"

A museum dedicated exclusively to the lore and history of ouija boards.

The lecture hall where Alexander Graham Bell first demonstrated the long-distance phone call.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

The isolated final resting place for perished coal miners.

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

A humble plaque marks the site where the country music legend was found dead in his Cadillac.

An abandoned 1920s school with a mysterious history.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

This abandoned amusement park was built on a site with a dark history.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Hop on the train and tour an elaborate miniature town made completely of junk (including the train).