Here are some pictures of this amazing mosque, the world second largest, after Mecca.  It does have the highest minaret (tower) in the world.  It was built in 1986 and has such features as electronically opening doors, which are made of titanium, by the way.  The basement also houses a full hammam and ablutions area.  You can see the scale of the mosque when you compare it to Ariane standing beside some of the doorways or fountains.

Oops, the picture at the top left is actually of a different mosque in the neighbourhood of the Royal Palace in Casablanca.