Iglesia de San Salvador de Altzo Abajo Monument · Altzo, Tolosaldea, Gipuzkoa Single-nave church with Gothic vaults, already documented in 1056 as the "Monastery of San Salvador de Ipúzcoa", the oldest known written reference to the name of Gipuzkoa. 1056 Photo: Zarateman (CC0) What to see and do in Altzo