Many of the streets in Old San Juan, the part of the city that was originally enclosed by the Wall, are narrow and hilly. They are covered by adoquine, a blue stone cast from furnace slag. The stones were brought to San Juan as ballast on Spanish ships in the 1700s. They were first used as road pavers in 1784.
I have seen cobblestone streets in Charleston, Nantucket, and a few other places, but never anything like this.
The streets are much bluer than my camera was able to capture. Amazing.
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