Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

A submerged village appears when dam levels drop.

The remains of diamond fever taken over by the desert.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

A Saint Nicholas-themed ghost town in the Mojave desert.

A geological bull's-eye visible from outer space.

Only hotel where you can legally launder money.

A former French military respite turned jungle tourism hotspot.

Empty since 1989, now falling into ruin.

A Turkish monastery tucked into a cliff wall.

A beautifully eclectic mix of architectural styles.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

A curious collection dedicated to human and animal anatomy and pathology.