An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.

The glowing blue Nymphaeum of Emperor Tiberius.

A toxic ghost town sitting atop a massive coal fire.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

Once the most densely populated place in the world, this island is now a ghost town.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

Surreal riveted sea forts once protected the Kent shores from German attack.

A house carved into a rock in the 1940s.

An unrealized dream to wirelessly electrify the entire Earth.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.