I visited this WHS in June 2016. I walked the whole loop on the walls as well as round the walls from beneath. The Roman walls are really huge, 4m thick and varying between 8 to 12m high. There are 88 towers and 10 gates, 5 dating back to the Romans and the rest added in the 19th century as the population increased. Up until quite recently there were sections of the outer walls to which houses were attached but these have been removed. A visit to the Centro de Interpretación da Muralla de Lugo in Praza do Campo helps to give detailed information on the walls' importance. The only tower with two arches hints to what the towers must have been like in Roman times. Next to the Santiago Gate is a white vertical slab with the UNESCO plaque. The Camino Primitivo and the Camino de Invierno both start or pass through Lugo. I enjoyed my stay in Lugo and I'm glad I stayed for 1 night within the walls. That way I could enjoy Lugo's everyday life from different viewpoints on the walls: from school children playing at lunchtime, people jogging, sunrise, sunset and the walls lit at night.