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Watch Mysteries at the Castle Season 1 Episode 1 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

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.