What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

The quiet canyon has a tumultuous history involving a doomsday cult.

The fossilized remains of ancient California redwoods.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The haunting ruins of Jack London's dream house.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A humid oasis combines recreation with exploration in a unique underwater cavern.

"Only the devil could play golf here."

A tunnel of hardened lava along Maui’s famous Road to Hana.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Beautiful natural falls where Satan once ruined a pot of beans.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

An abandoned theme park with a strange and tumultuous past.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

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

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.