Studying or reviewing Islam? Saudi Aramco Magazine is an excellent resource. You can read it online and you can also order a print subscription for free. Articles feature all aspects of historical Islam. You can take walking tours (virtual tours) of some of the most important Muslim mosques including Alhambra, Dome of the Rock, Suleymaniye, and Al Aqsa. The archives include articles on Ibn Batutta, the Indian Ocean trade network, Muslim science, and the minaret, to name just a few of the past topics. You can find other resources on Islam on my World Religions blog.