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There are numerous sites in Islam that are considered holiest to the religion.
Mecca and Hajj
Mecca is considered the holiest city in Islam. Only Muslims are allowed to enter Mecca. As one of the Five Pillars of Islam, every adult Muslim who is capable must perform the Hajj - a pilgrimage to Mecca - at least once in their lifetime. This obligation is only fulfilled if it is done on the eighth to twelfth day of the last month of the Islamic calendar.
Hajj is one of the largest annual Muslim gatherings in the world, only second to pilgrimages to the shrine of Hussain in Karbala, with attendance reaching 3 million in 2012. If, in a given year, an adult Muslim is in good health and his life and wealth is safe, they must perform the Hajj in the same year; delaying it is considered sinful unless the delay is caused by reasons beyond his/her control.