San Miguel de Arretxinaga Curiosity · Markina-Xemein, Lea-Artibai / Markina-Ondarroa, Bizkaia Hexagonal hermitage built in 1734 around three large natural stones that support its altar, a unique feature among Basque sanctuaries. 1734 Photo: Olazi (CC BY-SA 4.0) What to see and do in Markina-Xemein