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Being the main port in Puerto Rico, San Juan served as the funnel from where all the riches were exported to Spain. While ships navigated from Puerto Rico to Spain heavy and full of wealth, they often returned to the island mostly empty – thus very unstable in high winds. But, that changed in the 1700s when Spain started using cobblestones as ballast on their ships coming from Europe. Such cobblestones were used to pave the streets of Old San Juan, beginning in 1784. You'll notice, though, that these aren't typical cobblestones; they are grey-ish blue. These cobblestones were made using iron slag, the waste from smelting iron.

Directory for San Juan Puerto Rico