There's 2 reasons:
1) Because they want to
2) While making a pilgrimage (Hajj) he/she has to go through Madina. Besides, Muslims love to visit there and pray.
Islam first started in Makkah (Saudi Arabia), and then spread to Madina. After that, Muslims would travel around the world (the entire world), and teach people about Islam, and what it's all about.
Islam is practised all over the world by Muslims.
Islamic religion is not based in any particular country. True it originated in Saudi Arabia but it spread and is followed by Muslims all over the World. The focal point however is Saudi Arabia as all Muslims have to go for Pilgrimage to Makkah and Madina in Saudi Arabia for Hajj and Umrah.
You can find Muslims all over the world.Allover the world
Muslims live all over the world just as people of all other religions do
syria, Saudi Arabia and Egypt ___________________________________________________________ By Muslims all over the world
madina is most better in all world of duniya for all god
In Britain or all over the world.
Because of a video made in California Insulting the Muslims all over the world
Ferrets are owned by people all over the world
The Muslims from all over the world come to Mecca to perform Hajj.
All over the world as Muslims are spread almost in all world countries