Mecca is the holiest of cities to Islam: it was the place of birth of the Prophet Muhammed, it is where you find the Grand Mosque with the Kaaba and the well of Zemzem. All muslims dream of performing the pilgrimage to Mecca at least once in their life.
Mecca is not a tourist destination; almost all visitors come for religious reasons - to perform the the hajj or umrah pilgrimage. So for more info we would like to point visitors to Al Hajj webiste.
Mecca is off limits to non-muslims. There are check-points on the roads leading into the city. If a non-muslem is caught in the city. It theory this crime
is punishable by death.