Introduction to the Hassan Grand Mosque: Located in front of the tomb of Mohammed V, it was originally the largest mosque in North Africa. It was built in the 12th century and is 183 meters long and 139 meters wide. It is said to have been destroyed in a famous earthquake in 1775 with Lisbon as the epicenter. Earthquake, its former majesty can still be imagined from the only 312 remaining large stone pillars.