The Morro is the rocky cliff that drops sheer to the Pacific at the south end of the city. A switchback road and a stepped footpath both lead to the top, which sits 130 metres above the sea and gives a clean view across Arica, the port and the long line of the desert coast.
The summit was the decisive battlefield of the War of the Pacific in 1880, when Chilean troops took the Peruvian batteries by assault. The Museo Histórico y de Armas on top covers the battle and the units involved, with cannons, uniforms and a panoramic-window orientation room. Allow an hour for the climb and the museum. Best at sunset when the light hits the buildings below.