Designed by French architect Michel Pinseau, construction of the Hassan II Mosque began in July 1986 on land reclaimed (without compensation to the former residents) from a run-down area near the sea. The goal for completion of the mosque was King Hassan II's 60th birthday in 1989, but it ended up not being finished until August 30, 1993.

At 689 feet, the Great Mosque's minaret is the tallest structure in Morocco and the tallest minaret in the world. At night, lasers shine a beam from the top of the minaret toward Mecca, "to point the way to God." The building was designed to withstand earthquakes and has a heated floor and electric doors.

The project is estimated to have cost as much as $800 million, funds that were remarkably raised entirely from public subscription.

International reports have suggested both local resentment and less-than-voluntary donations to the project, but Moroccans seem to be genuinely proud of their monument and pictures of the mosque are displayed in homes and cafes throughout the country. The massive fundraising also had a positive side-effect: it temporarily reduced Morocco's money supply and brought down inflation.

Nearly all the materials of the Hassan II Mosque are from Morocco, with the sole exceptions of the imported white granite columns and glass chandeliers (from Murano, near Venice). The marble is from Agandir, the cedar wood is from the Middle Atlas and the granite comes from Tafraoute.

Over 6,000 Moroccan master craftsmen and artisans were employed to work these local materials into the dazzlingly intricate decorations that embellish the entire structure. When construction passed its deadline in the early 1990s, 1,400 men worked by day and 1,000 worked by night to bring the vast project to completion.

(source: http://www.sacred-destinations.com/morocco/casablanca-hassan-ii-mosque.htm)