A strange alien shrine on a mountain peak in
Bulgaria was once the pride of the Communist Party. What was it used for during its peak, and what led to its abandonment? #ScienceChannel #MysteriesOfTheAbandoned

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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