Located in Casablanca is the largest mosque in Morocco  and the fifth largest mosque in the world. Designed by the French architect  Michel Pinseau and built by Bouygues

Hassan-II-Mosque

.[1]  It stands on a promontory looking out to the Atlantic, which can be seen through a gigantic glass floor with room for 25,000 worshippers. A further 80,000 can be accommodated in the mosque’s adjoining grounds for a total of 105,000 worshippers present at any given time at the Hassan II mosque. Its minaret is the world’s tallest at 210 m (689 ft).

source : http://thewondrous.com