Built in 1675 by Imam Bil-Arab Bin Sultan, Jabreen Castle was an important centre of learning for astrology, medicine and Islamic law and, unusually for Oman's forts and castles, there's quite a lot to discover inside the vast battlements. There is an interesting date store, for example, to the right of the main entrance on the left-hand side. The juice of the fruit would have run along the channels into storage vats, ready for cooking or to assist women in labour.