The Memorial Bell Tower, which stands as a welcoming beacon to campus visitors, was built in 1923 as a memorial to the many PA graduates and faculty members who died in World War I. It stands on a plot of land that once served as a military parade ground and where, it is said, President George Washington reviewed the troops during his visit to Andover in 1789. Thanks to its renovation in 2006, its bells, which were silenced in 1989, chime throughout the day on the hour and the half hour and to mark special occasions.