This fort was completed in 1866, although the upper level of one side was destroyed in 1889 to make way for more modern weapons, with the older cannons being buried within the new outer wall to save on materials, and the fort was heavily used again during the 1898 Spanish American War. In 1947 the fort no longer of use to the army, was turned over to the U.S. Navy for maintenance. In 1968 volunteers led by Howard S. England excavated Civil War guns and ammunition bured in a long abandoned parts of the fort, which was soon discovered to house the nation's largest collection of Civil War cannons. Fort Taylor was therefore placed on the National Register of Historic places in 1971, and designed a National Historic Landmark in 1973. Due to the filling in of land around the fort, including the creation of an attractive stretch of beach, the park now occupies 87 acres.
The fort's land that is closer to downtown Key West became part of the Truman Annex to Naval Air Station Key West. The annex was originally called Naval Station Key West until its closure in 1974 and included a submarine base. President Harry S. Truman used it for his Winter White House for 175 days in 11 visits. The secret service had a private beach built on the land for the presidents secuirty, but he reportedly only visited it once, preferring the public beaches. The beach named is called Truman Beach. The fort, along with its related support buildings, was later renamed for Truman.
Naval Station Key West was decommissioned in 1974 because the U.S. had decommissioned nearly all of their diesel electric submarines and contemporary nuclear powered submarines were too big for the existing port. Most of then former naval station became an annex to the remaining Naval Air Station Key West and served as the landing point for many during the 1980 Mariel boat lift of Cuban refugees. Those buildings in the Truman Annex and associated real estate not retained by the navy as part if NAS Key West were sold to private developers. Theres a museum for the Truman White House and the navy continues to own and maintain the piers and that portion of the naval station property to the south of Fort Taylor, primarily in support of Joint Interagency Task Force South and the Naval Security Group Activity. This is such a gorgeous place to visit and stay on vacation because there is so much to do, and tours of the historic fort are offered at 12 daily.