Tuesday, June 7, 2016
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.