This tiny, 1742-built fort is located on Rattlesnake Island, near where Menendez de Avile executed hundreds of shipwrecked French soldiers and colonists when rations at St Augustine ran low. Today it makes a terrific excursion via a free five-minute ferry that launches every hour (at half-past) from 9:30am to 4:30pm, weather permitting. Once there, the ranger provides an overview and lets you wander.