York’s City Walls are FREE. They are open to walk on from about 8.00am to dusk daily (except in conditions when repairs/maintenance, snow or ice may make them dangerous)
York’s medieval City Walls (or “Bar Walls”), a scheduled ancient monument encircling the historic City of York, comprise 3.4km (2 miles) of surviving masonry. They are the longest town walls in England. They were built mainly in the 13th century of magnesian limestone and, uniquely in England, were set on earthen ramparts.
York’s City Walls offer a splendid elevated walk around the city.