Mysteries at the Castle

On a rocky outcrop in central Germany stands the forbidding ruins of a monstrous castle where a scientist conducted a series of sinister experiments. Hidden within one of England's most famous country manors is the story of long-buried Egyptian treasure. And half a mile from the coast of France is the tiny island of Sainte-Marguerite, home to the forbidding Fort Royal, where a mysterious masked prisoner was locked up for decades.

Learn about the legendary heist that took place inside the iconic Tower of London, explore an impenetrable bastion in France where a controversial literary giant was jailed, and visit an ancient German castle that may hold a centuries-old secret.

Visit a British manor house that inspired a literary masterpiece, tour a sprawling New York mansion that belonged to a railroad baron and explore a German castle that served as a prisoner-of-war camp in World War II.

Explore an English country estate that was at the heart of a bizarre inheritance dispute, tour a colonial mansion in Virginia with a grisly medical past, and visit the ruins of a Scottish castle.

Visit a giant fortress in Scotland where a 15th-century power struggle climaxed, explore an Italian villa that housed a mysterious manuscript, and tour an upstate New York mansion that belonged to one of Abraham Lincoln's closest advisors.