With glass floors to view the ocean beneath, a sliding roof so that prayers can be offered in sunlight or under the stars and doors crafted from titanium, the Hassan II Mosque in Casablanca combines ancient tradition with modern technology. Not only is it the largest mosque in Morocco and Africa, but at 210m also boasts the tallest minaret in the world. To top that, the summit of the minaret incorporates a laser with a 30km beam angled in the direction of Mecca.