Monastery of San Anton Ruins is just one of the landmarks located 2.2 mi (3.6 km) from central Castrojeriz, so you might want to stop by for a few pics during your trip.
If you're planning a bit of sightseeing during your trip, head to Convent of Santa Clara— just one of the landmarks located 0.8 mi (1.3 km) from central Castrojeriz.