The King Hassan II Mosque (w) in Casablanca is one of the largest mosques in the world. The largest mosque in the world is Masjid al-Haram (w) in Mecca, but there is some disagreement which is the second largest. Some people claim it to be the Hassan II mosque, while others say it's the Shah Faisal mosque in Islamabad (w). It's funny to watch the Wikipedia articles about them change as people edit them to "support" their choice. My guide to the mosque in Casablanca claimed that this was the second biggest in the world, but when I asked her about the Shah Faisal mosque she claimed she didn't know about it. In number terms, the Shah Faisal mosque can hold more worshippers inside, as well as in the courtyard.
(25,000 inside, 80,000 outside for the Hassan II mosque in Casablanca)
(34,000 inside, up to 300,000 outside for the Shah Faisal in Inslamabad)
It does however have the world tallest minaret, at 210 meters (689 feet).
A good description can be seen at Sacred Destinations.
View of the mosque from the large courtyard in front.
View of the mosque from the large courtyard in front.
View of the mosque from the large courtyard in front.
Arches near the entrance to the mosque.
Close-up of a wall near an entrance.
Inside of the mosque.
Inside of the mosque.
Inside of the mosque.
Inside of the mosque.
Close-up of a wooden ceiling inside of the mosque.
Wooden screen with a seat.
Ablution (Wudu) (w) area.
Ablution (Wudu) (w) area.
Ablution (Wudu) (w) area.
Ablution (Wudu) (w) area.
Ablution (Wudu) (w) area.
One of the entrances to the mosque.
Arches near the entrance to the mosque.
Arches near the entrance to the mosque.
The mosque's minaret.
Another one of the entrances to the mosque.
The mosque's minaret.
View of the mosque from the large courtyard in front.
Man wearing a traditional robe walking to the mosque.
View of the mosque from the left.
Close-up of some windows, taken inside of the mosque.
Close-up of the ceiling.
Close-up of a wall, inside of the mosque.
Close-up of a wall, inside of the mosque.
Close-up of a wall, inside of the mosque.
Close-up of a wall, inside of the mosque.
Close-up of a wall, outside of the mosque.
Close-up of a wall, outside of the mosque.