The Louvre

Look around you. Millions of people walk through these halls every year, and most of them come for one painting. But the Louvre has secrets that go far deeper than the Mona Lisa.

Napoleon actually hung the Mona Lisa in his bedroom. A personal touch from a man who never did anything small. Later, in 1963, Jacqueline Kennedy arranged for the painting to travel to America, kicking off what historians call the world's first blockbuster exhibition.

Then there's the theft. In 1911, an Italian handyman who had worked here just two years earlier simply walked out with the painting under his coat. He hid it behind a false wall in his Florence apartment for two full years before getting caught.

And when World War II arrived, the curators didn't wait around. They secretly moved nearly every valuable piece to private châteaux scattered across the French countryside. When Nazi soldiers entered Paris and pushed open these doors, they found an almost empty museum. Just the heaviest sculptures remained, wrapped in burlap sacks.

Eight hundred years of history, hidden, stolen, and quietly saved. Not bad for a building that started as a medieval fortress.