San Martin’s Castle (El Castillo de San Martín), built on top of pre-Roman ruins on the bank of the River Nalón near Soto del Barco Published November 2, 2019 at 5323 × 3549 in Camino del Norte – Day 21 – San Martín de Laspra to Soto de Luiña, 32km ← Previous Next → San Martin’s Castle (El Castillo de San Martín), built on top of pre-Roman ruins on the bank of the River Nalón near Soto del Barco