Desert Castles : Jordan's desert castles, beautiful examples of both early Islamic art and architecture, stand testament to a fascinating era in the country's rich history. Their fine mosaics, frescoes, stone and stucco carvings and illustrations, inspired by the best in Persian and Graeco-Roman traditions, tell countless stories of the life as it was during the 8th century. Umm El jimal: Umm Al Jimal is considered an Arabian Oasis for the desert caravans. It is eighty six kilometers away from the capital, Amman, and it is well known as "the Black Oasis", as it contains a large number of black volcanic rocks. History of this city goes back to the Romanian Byzantine Age.