Dexter's downtown is dominated by the Memorial Building, designed by John Morrison. At its top is the community's largest clock, named Nancy after the architect's wife. The tallest building in town is the Unitarian Universalist Church. It is also Dexter's oldest house of worship, built in 1826, but given a new steeple and vestibule by Boston architect Thomas W. Silloway in 1869. Five buildings in Dexter are listed on the National Register of Historic Places, including the Dexter Grist Mill; Universalist Church; Abbott Memorial Library by Boston architect J. Williams Beal; the Bank Block by Bangor architect George W. Orff; and "Zion's Hill", the Ralph Owen Brewster house by Portland architectural firm J. C. & J. H. Stevens.