In Sintra, Portugal, a mysterious, private garden, kept under lock-and-key for the last century, is explored. Winding tunnels stretching deep into the Earth are adorned with various types of iconography, all serving an elusive purpose.

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About Mysteries of the Abandoned:
The world's most incredible engineering projects are revisited to uncover why places full of mysteries and untold secrets are now abandoned ruins.

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Learn about outer space, leading scientific exploration, new technology, earth science basics, & more with science videos & news from Science Channel.

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