San Juan
The Blue Cobblestones
Portrait
El Morro and San Cristóbal were built over two and a half centuries to hold the harbour that controlled Spanish shipping in the Caribbean, with six levels of guns and walls up to twelve metres thick; Drake failed to take them in 1595. The blue cobblestones of the old town are adoquines, cast from iron smelting slag and used as ballast on ships from Spain.
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