It's called Castillo de San Marcos and it's the oldest masonry castle in the US. The castle, built in 1672, protects the city of St Augustine and defend Spain's claims to the New World. The Castillo design evolved from the medieval castle. A towering castle was too vulnerable to artillerist. So they lowered their target-like walls, and added large mounds of dirt to stop … [Read more...] about Sleeping under the St Augustine Fortress