VISITOR CENTER Open All Year varying hours check: Gulf Island National Seashore
Location - Pensacola Beach, Florida the very west end of Santa Rosa Island.
The fort was originally constructed to guard the mouth of the harbor and the Navy Yards within. It has also served as the prison for Indian warrior Geronimo.
An explosion in a gunpowder storage area destroyed a corner of the fort in 1899. For WWI and WWII modifications were made that take some of the Civil War Era ambiance out of the fort. I prefer Fort Barrancus on the mainland when I want to show my kids a "real" fort.
However, Ft. Pickens is on the westernmost point of this barrier island, and that means better beachcombing. The tides seem to deposit more shells here than on more eastern portions of Santa Rosa Island. So take a break from the fort tour to visit the beach. Don’t expect to find any dandies, as professionals stop every morning to check out the best spots. Still, the shells you find will probably be better than those at crowded beaches like Ft. Walton.