We visit an iconic German castle that was the site of a gruesome 17th century science experiment, tour the ancestral home of an English aristocrat struck down by an ancient curse, and inspect an isolated French fortress.

We tour England's iconic Tower of London; explore an impenetrable bastion in the South of 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 the creepy masterpiece, tour a sprawling New York mansion that belonged to a Gilded Age robber baron and explore a German castle that served as a prisoner-of-war camp in World War II.

We explore an English country estate that was at the heart of a bizarre inheritance dispute, tour a colonial mansion in Virginia to understand a grisly medical experiment, and visit the ruins of a Scottish castle.

We visit a giant fortress in Scotland where a 15th-century power struggle climaxed, explore an Italian villa that housed a mysterious manuscript, and tour a upstate New York mansion.

A Transylvanian castle provides the inspiration for an infamous literary villain; a French chateau incites a bitter rivalry between two powerful women; and a mythical monarch steps-into the real world at an English Abbey.