Iglesia de la Asunción y dólmenes de Alsasua Monument · Altsasu/Alsasua, Sakana, Navarra The 16th-century parish church of Nuestra Señora de la Asunción presides over the town center. Several megalithic dolmens are also preserved in the municipal area, including those of Balankaleku and Munaan I and II. iglesia del siglo XVI Photo: Zarateman (Public domain) What to see and do in Altsasu/Alsasua