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PETERSBURG, RUSSIA-May 2, 2015: Smolny Cathedral was built in 1748-1764, and over 50,000 wooden piles were needed to #164133306
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PETERSBURG, RUSSIA-May 2, 2015: Smolny Cathedral was built in 1748-1764, and over 50,000 wooden piles were needed to secure the foundation in marshy soil of Petersburg
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