Just a few miles from Novalja, a strange geological oddity has left scientists baffled.

Humble beginnings for one of the world's most famous scientists.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Yugoslavia's biggest underground airport lies in ruins.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Temporary Burning Man sculpture made of two 18-wheelers.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

Fans of vintage Vegas, kitsch, and toy pony-based gambling now flock to a casino called The D.

This ramshackle ghost town is comprised of mining-era buildings collected from around the region.

One of the ghostly stops along Route 66.

Abandoned Air Force base that has fallen into disrepair.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

This childhood throwback has hundreds of arcade games and pinball machines to transport you back in time.

The ghostly remains of what was once the world's richest copper mine.

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

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Odd outsider art installations surround a Gold Rush-era ghost town.

The ghost town that ended up on Ebay.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A fashion designer's dazzling world of Japanese collectibles is hidden in a warehouse downtown.

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

Once the central jail for Los Angeles, this building housed inmates like Al Capone, those arrested from the Zoot Suit and Watts Riots, and individuals imprisoned for their sexuality.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.