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Circa 1906. "Calle de San Francisco, San Juan, Puerto Rico." 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.
Today this is a beautiful street with vibrant colors. The cobblestones are actually Blue.The blue cobblestones that originally paved the streets of all of Old San Juan are now being replaced with new ones. The original cobblestones (adoquines in Spanish) were cast from iron slag, which is the waste from iron smelting. They were brought as ballast in the bottoms of European merchant ships in the 1700s. They were first used as road pavers in 1784.
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