"One of the most notable features of the Blue Mosque is visible from far away: its six minarets. This is very unique, as most mosques have four, two, or just one minaret. According to one account, the Sultan directed his architect to make gold (altin) minarets, which was misunderstood as six (alti) minarets.
Whatever the origins of the unique feature, the six minarets caused quite a scandal, as the Haram Mosque in Mecca (the holiest in the world) also had six minarets. In the end, the sultan solved the problem by sending his architect to Mecca to add a seventh minaret." (Stolen from this Sacred Destinations-Click here.)