In the columns around the hall, 360 speakers are camouflaged into the stonework.
It minaret (tower like part) is 210m high. 25,000 people fit inside to pray and 80,000 can fit on the courtyard outside. Muslims pray on a prayermat, so they need more than standing room. This mosque can accommodate more people than Croke Park!
Hassan II Mosque is relatively new. It took 6 years to build and was completed in 1997. It had 6000 workers employed and they worked 24 hours a day by having 2 shifts.
The mosque is named after King Hassan II. He decided to build it to commemorate his own 60th birthday. King Hassan II died just 2 years after the mosque was completed.
The mosque juts into the sea. This is a man made peninsula because the Quran says that Gods throne was built upon water.
Another interesting part if you look at the first photo is that the roof can open. There is no air conditioning in the mosque so during the summer, especially if the mosque is full inside, the roof slides open.
For winter time when it's cooler, the mosque floor is heated.