Guildford's steep cobbled high street is one of the finest in southern England, climbing from the River Wey to the dramatic modern cathedral on Stag Hill. The medieval Guildhall with its ornate clock projects over the pavement, while the ruined Norman castle keep offers views across the town. The River Wey Navigation, one of Britain's first canal systems, now provides peaceful towpath walks. The Yvonne Arnaud Theatre and modern shopping centres complement the historic core and surrounding Surrey Hills countryside.