Castillo de San Marcos A Guide to Castillo de San Marcos National Monument, Florida

"Castillo de San Marcos" by United States National Park Service is a historical guide from the 20th century that explores the Castillo de San Marcos National Monument in Florida. The book recounts how St. Augustine, the oldest continuously inhabited European-founded community in the United States, came to need serious defenses after a pirate raid in 1668. This situation led to the building of the Castillo de San Marcos, and the guide dives into the mix of cultures—Spanish, Indigenous, and European—that shaped the fort's story and how it helped protect Spanish lands from enemies. It's basically a look at Spanish efforts to build and defend their settlements in a new world full of conflict and competition.