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City Map with Features
Construction of the massive City Wall surrounding Old San Juan was begun in the 1630's. Two 42 foot high parallel walls were built of solid sandstone blocks, held together by mortar, limestone, sand and water, and the space between was filled with sand. The designers slanted the wall's exterior face to maximize protection, so its width varies from 20 feet at the base to 12 at the top.
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San Juan Puerto Rico
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