The Old Town unfolds around the 12th-century Catedral de San Martiño, in a maze of narrow streets and small plazas that are a pleasure to wander. Among the stone-flagged streets, stone-faced buildings and stone arcades, with almost no vehicular traffic, you may have to remind yourself you're in the 21st century. The largest square is sloping Praza Maior, rimmed by old stone buildings with cafes under the arcades and the classical-facaded Casa do Concello at its foot.