Fort Harrison, Clearwater, Pinellas county, Florida

Around 1835, the United States Army began construction of Fort Harrison, named after William Henry Harrison, as an outpost during the Seminole Wars. The fort was located on a bluff overlooking Clearwater Harbor, which later became part of an early 20th century residential development called Harbor Oaks. University of South Florida archaeologists excavated the site in 1977 after Alfred C. Wyllie discovered an underground ammunition bunker while digging a swimming pool on his estate.

The area's population grew after the Federal Armed Occupation Act of 1842 offered 160 acres (0.65 km2) to anyone who would bear arms and cultivate the land. Early settlers included the Stevens, Stevenson and McMullen families, who claimed and farmed large tracts of land. Prior to 1906, the area was known as Clear Water Harbor. The name "Clear Water" is thought to have come from a fresh water spring flowing from near where the City Hall building is located today. There were many other freshwater springs that dotted the bluff, many in the bay or harbor itself.