A cannon on the gun deck of the Castillo de San Marcos faces downtown St. Augustine, FL. The fort, which was built by the Spanish in the 17th century, is designated as a U.S. National Monument. Click the above image to enlarge, or click to view my high-resolution photo gallery. You can also read my feature article “Haunted South: Beyond the Grave,” which includes a section on a supernatural legend that’s connected to the fort.