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The Spartans were the most feared military force in the Greek world, earning legendary status in their wars against Persia—but how they got so powerful is anything but pretty.

For years, cruise ships were seen as floating condos for retirees—but in the past few years, the industry has begun to shed that image, with the average age of customers going down…and revenue going up. The industry is expected to make a whopping $30 billion in 2024. But cruises go back much longer than most people realize—and have a surprisingly dark history.

Near the end of WWII, the Third Reich hid their greatest secret within Poland’s Owl Mountains—a network of tunnels with a mysterious purpose. It was a bizarre project with the code name "Riese".

The Paisley Caves revealed evidence of humans that predates the Clovis culture—and completely rewrites the historical timeline of North America.

Osceola thought he could make peace with President Andrew Jackson, but it was Jackson’s betrayal of their truce that led to his brutal downfall.

The Bandelier National Monument is famous for its Ancestral Pueblo artifacts—but few know about its secret use during World War II.