Completed in 1695, the Castillo de San Marcos in St. Augustine, Florida, is a oldest masonry fortress in the continental United States. With thick coquina walls that simply absorb cannonballs, the old fortress has never been taken by force.
The Castillo de San Marcos in St. Augustine, Florida. |
For today's writing prompt, put an old fortress to the test in a modern context as a defense against aliens, or climate change, or civil unrest.