View of the old town of Ágreda, province of Soria Castile and León, Spain. Ágreda was a significant town in the Middle Age as strategic border location between the kingdoms of Castile, Aragon and Navarre. The town has a very diverse monumental heritage as it was an important center of the arts and handcrafts where Christians, Jews and Arab-descendants lived in peace. Ágreda is also known as "The Town of the Three Cultures".