15 Must-See Endangered Cultural Sites | Travel | Smithsonian
Not for nothing is Italy's Fenestrelle Fortress know as "Great Wall of the Alps." Covering 320 acres, it is one of the largest fortified structures in Europe. (Andrea Vettoretti, AFPT)

15 Must-See Endangered Cultural Sites

Some of the world's most precious and historic sites can be visited today—but might be gone tomorrow

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