Mussolini's Iron Tooth Defense, Vallo Alpino | Mysteries of the Abandoned | Science Channel

Vallo Alpino was a system of fortifications built across Italy's northern border in the years preceding World War 2. Today the conical structures stretch menacingly across a picturesque mountain scene, abandoned.

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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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