A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

All that's left of the quintessential "cabin in the woods."

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Eighteen miniature death-scene dioramas.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

Home of an evil witch famous within southern folklore.

Continuing the tradition of the dime museum in style.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

A sculptor's dream castle turned fantastical ruin.

A haunted hill that supposedly defied gravity.

The beauty of urban decay, hiding some dark secrets.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.