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Watch National Geographic: The Girl in the Glass Casket online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

She is believed to be one of the best-preserved mummies in history Rosalia, a lifelike 2-year old girl encased in a glass-topped casket for over 90 years. Amazingly, her skin and delicate curls of hair remain intact. But Rosalia and the other mummies deep in the catacombs of Palermo, Italy, have started to show signs of decay. Now, a team of scientists are fighting to preserve her remains. To save Rosalia, they'll need to decipher the technique of her conservation.