Castillo de Carlos V Monument · Hondarribia, Bidasoa Beherea / Bajo Bidasoa, Gipuzkoa Medieval fortress remodeled in the 16th century, located in the upper part of the historic center. It was restored in 1968 and converted into a Parador Nacional, a use it retains today. 1968 Photo: Zarateman (CC BY-SA 3.0 es) What to see and do in Hondarribia