This is one of the South's largest and most important earthworks fortifications from the Civil War, so tough it was known as the Southern Gibraltar. You can explore the restored battery with its reconstructed artillery and follow trails with viewpoints and exhibits. Inside, a range of desplays ranges from Civil War relics and a fiber-optic battle map to artifacts from sunken blockade runners, weapons and exhibits about life at the fort for the soldiers and their families.
It's also known for its underwater archaeology sites. Guided tours led by costumed docents are sometimes available; call for details.