Festival of los Güevos Pintos Activity · Siero, Oviedo, Asturias Image of Siero, not of the place itself. It is held in Pola de Siero on the Tuesday after Easter Sunday and fills the town with boiled eggs decorated by hand with Asturian motifs. It has been declared a festival of national tourist interest since 1968. Photo: Puxapiti (Public domain) What to see and do in Siero