The Alfred B. Maclay State Gardens is a 1,176-acre Florida State Park, botanical garden and historic site, located in Tallahassee, in northeastern Florida. The address is 3540 Thomasville Road. The gardens are also a U.S. historic district known as the Killearn Plantation Archeological and Historic District. It received that designation on August 16, 2002. According to the National Register of Historic Places, it contains 18 historic buildings, 4 structures and 4 objects.