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

Continuing the tradition of the dime museum in style.

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

As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

A dragon-shaped fountain that is said to dispense healing water—unless you're evil.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

The only natural cave bath in all of Europe.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

These abandoned grain silos and tunnels are an urban exploration dream.

One of the few Cold War-era bases with many of its original structures still standing.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

An abandoned bait shop with a front lot filled with storage boxes.

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

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

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

An abandoned putt putt golf course nestled hidden next to one of the local water towers and a local veterinarian.

On land once deemed “valueless,” a multipurpose community garden proves the potential of urban farming.

Nature (and graffiti) reclaim this old waterworks that has been surrounded by a bike path and network of walking trails.

An abandoned munitions storage facility with a rich architectural history.

The only zoo where you can buy animals that won't need feeding.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

Local myth claims this is a Sears catalogue home with its windows installed upside-down.