Phra Sumen Fort , adjacent river Canal Old Canal or around the northern city built since 2326 in the reign of the first objective is to prevent capital fortress built 14 forts,Shape of the fort is an octagonal base, second base, first floor with stairs to the second floor and the surrounding bases. The walls of the second floor shaped battlements. Doors, windows, drill a square hole Vents and drilled a sharp curve is periodic. Around the walls are drilled into the shape of a cross around it. The roof is wood, plaster.