Al-Azhar Mosque (part 1)
Cairo's Al-Azhar Mosque (built in 970) is one of the oldest and most important mosques in Egypt, and indeed in all of Islam. Unlike the Ibn Tulun Mosque, which is mostly a tourist attraction these days, it's a working mosque and medressa, with a prestigious university of its own, which attracts students from all over the world. Non-Muslim visitors are allowed to enter to mosque, but are expected to pay generously for the privilege.
I had a bit of Photoshop fun with the mosque's towers. Interesting, isn't it, the difference a perspective tool can make?
Cairo, Egypt, 2004