Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

148 feet long and in the middle of a verdant forest.

Famous for its bio-luminescent inhabitants, known as "dismalites."

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

A trio of colossal statues spread across a Dallas neighborhood chart the emergence of a giant robot born of a locomotive and spilled gin.

The summer home of the largest colony of bats in the world.

Now abandoned, this East Austin school for the disabled began as the "State Colony for the Feeble-minded."

A grove of colossal man-made flowers built to collect the sun's rays.

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

This failed condo development was reborn as a street art hub.

A popular swimming hole that hides one of America's most deadly diving spots.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

This Texas windmill field celebrates the power and majesty of the very winds that blow.

Some islands... they come, they go, especially on Lake Travis.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A modernist landscape of water and sci-fi concrete.

An emerald-green grotto just a short trip from Austin.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

Crumbling hotel echoes with the sounds of the '30s.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Towering basalt columns, a creation of fire and ice.