Built in 1794 to "protect" the Cherokee from encroaching settlers the Blockhouse served as the official liaison point between the United States Government and the Overhill Cherokee people. The Blockhouse stayed in service from 1794 until 1807. Today it is surrounded by water from a TVA dam built in the 1930's it originally was near the top of a large ridge. Several significant treaties were signed between the Cherokee and the U.S. government and the Blount Conspiracy was initially exposed there as well. You can find further information on this Wiki post and on the State Park's website.