Duncannon Plantation was founded in 1802 by Joseph Harley. Historic plantation home circa 1835 completely restored to original beauty, working transoms over doors, 10 gas FP indoors, plus a 2BR, 2BA caretakers cottage in rear with 2 FP. This plantation was built in 1835 by Joseph Harley. Previously called Walker Plantation after George Herbert Walker, maternal grandfather of President George Herbert Walker Bush Sr.