Ruins

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Terrifying derelict military hospital once housed a recuperating Hitler.

The "Mystery and Company of Merchant Adventurers" is an Elizabethan-era hangout in Moscow.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The ancient tomb acts as a calendar that keeps perfect time.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

America's oldest archaeological site or a muddled case of wishful thinking.

An ancient Viking village in North America that predates Columbus by 500 years.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Where commuters walk through remnants of an ancient Greek necropolis.

Ancient mysterious ruts carved in the bedrock.

The largest earthwork effigy in the world.

Hoax, mistake, or evidence of dinosaurs in human times?