there is no grand mosque...many large towns have a grand mosque that heads the smaller ones and some countrys have a grand mosgue to head all mosque in the country..there is no grand mosgue ..most people think the grand mosque is the mosque in mecca but it isn't not...even to is in mecca it don't control all mosque worldwide so there is no grand mosque as in control of all mosque but many mosque called grand mosque like for example the grand mosque of Kuwait or the grand mosque of mecca or the grand mosque of abu dhabi just to name a few on national level...but is no main controling mosque .....

king Fahd expanded the grand mosque but the grand mosque was built a very long time ago.

Grand Mosque - Kuwait - was created in 1986.

Conakry Grand Mosque was created in 1982.

Tarsus Grand Mosque was created in 1579.