The culprit who accidentally lit this 3,500-year-old tree on fire stated "I can't believe I burned down a tree older than Jesus."

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

An abandoned water sports stadium that has become a haven for graffiti and decay.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

This overgrown Illinois water park offers a whole new type of adventure.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

All of Chicago's wood-paved streets are long gone but two alleys remain.

A theater sits abandoned on Roosevelt Road, once majestic in splendor, now majestic in decay.

Urban explorers embraced America's now demolished first suburban mall, south of Chicago.

Former bath house turns gastropub.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

Shop of curiosities with a dinosaur museum tucked in its basement.

A Spanish forest is filled with mysterious stone carvings.

An unusual manor of stunning beauty, born out of a crippling disease.

A remarkably intact castle that once was the largest in Ireland.

This single room has survived the centuries with almost no deterioration.

A mechanized clock where a man fights off a dragon, crab, and rooster.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

Opulent downtown movie theater now houses cars as an indoor parking garage.