 This ""Queen Anne fronts and Mary-Anne backs"" architecture occurs repeatedly in Bath.In front of the Royal Crescent is a Ha-ha, a trench on which the inner side of which is vertical and faced with stone, with the outer face sloped and turfed, making the trench, in effect, a sunken fence or retaining wall.The ha-ha is designed not to interrupt the view from Royal Victoria Park, and to be invisible until seen from close by.