Historic Weapons Demonstrations Check out the Historic Weapons Demonstrations at the Castillo de San Marcos National Monument … every week on Saturday and Sunday!  Join park staff and volunteers (usually dressed in period garb). Hear history come alive with the boom of cannon or musket fire! Demonstrations are usually on the Castillo’s gundeck (upper level [...] The post Historic Weapons Demonstrations appeared first on St. Augustine, FL | Oldcity.com.