Air date: 2021-05-20

Runtime: 45 min

The world's abandoned structures hold new evidence about the lives and deeds of history's greatest heroes and villains, and using the latest discoveries at these mysterious sites, experts count down the ten most significant.

Air date: 2021-05-27

Runtime: 45 min

A collection of ramshackle structures with a mystical facade lie mysteriously deserted on the tropical island of Bali; experts investigate and uncover the ruins of a bizarre amusement park complex with a disastrous past.

Air date: 2021-06-03

Runtime: 45 min

Experts investigate bunkers that conceal a deadly nuclear secret.

Air date: 2021-06-10

Runtime: 45 min

Experts investigate the deadly legacy of an abandoned sea fort.

Air date: 2021-06-17

Runtime: 45 min

A desert island contains a marooned structure with a contagious past.

Air date: 2021-06-24

Runtime: 45 min

A war-torn Italian ghost town immortalized by a legendary Hollywood director blurs the lines between fiction and reality; experts investigate and uncover a forgotten landscape of ruins captured in a WWII documentary.

Air date: 2021-07-01

Runtime: 45 min

The ruins of a dreamlike Polish palace hide an astonishingly dark history that's shrouded in mystery to this day; experts investigate and uncover an ornate gothic structure that concealed a nightmare of Nazi experimentation.

Air date: 2021-07-08

Runtime: 45 min

A breathtaking stainless steel tower seems otherworldly and out of place in the remote mountain forests of Croatia; experts investigate and uncover a dark past of Nazi-led conflict and a monument to a desperate fight for survival.

Air date: 2021-07-15

Runtime: 45 min

Experts uncover a derelict resort complex constructed by the Russian mafia.

Air date: 2021-07-22

Runtime: 45 min

The haunting remains of an isolated ghost town high in the Colorado mountains suggest a once booming mining community left in devastation; experts uncover an inhospitable land of shattered dreams where fortune seekers chased the American dream.

Air date: 2021-07-29

Runtime: 45 min

An enormous concrete box with bizarre circular openings looms on the coast of an island near mainland China; Experts investigate and uncover tunnels leading to an enormous underground complex that nearly triggered a nuclear war.