Egmont Key is a Florida State Park that is now primarily a wildlife refuge but has a military history as well. It was a strategic military fort (Ft. Dade) during the Spanish American War and held military significance through WWI & WWII.
We arrived by boat (The only way you can) and waded onto shore to explore!
These are the ruins of an Artillery battery from 1906. There were later removed and sent to France in 1917.
I didn’t see a sign for this, but it appears to be a bomb/artillery shelter. The sandbags are actually concrete. The bag themselves are gone.