Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Cathedral of Our Lady of Tortosa -  Cathedral of Our Lady of Tortosa (Arabic: كاتدرائية طرطوس‎) was a Crusader-era cathedral in the city of Tartus Syria. It was built by the Crusaders in the mid-twelfth century and functioned as both a fortress and a church. It has been described by historians as the best-preserved religious structure of the crusades. It now serves as the National Museum of Tartus.
Answer:
Building