The Hassan II Mosque is a mosque in Casablanca, Morocco. It is the largest mosque in Morocco, the second largest in Africa, and the 5th largest in the world. Its minaret is the world's tallest minaret at 210 metres. The mosque stands on a promontory looking out to the Atlantic Ocean. The walls are of hand-crafted marble and the roof is retractable. A maximum of 105000 worshippers can gather together for prayer: 25,000 inside the mosque hall and another 80,000 on the mosque's outside ground. Source Wikipedia