Muslim's Pilgrimage to Mecca

The second major Islamic celebration takes place during the time of the Hajj, or the annual prilgrimage to Mecca. This week-long event occurs two months and ten days after Ramadan ends. It is the fifth pillar of Islam,called Hajj, so it is a religious duty that should be done at least once in the lifetime of a Muslim. However if someone is too poor or unable to take the journey they are excluded from that rule.
Mecca is the most holiest city in the religion of Islam, because it is the birthplace of Muhammad. During Hajj  millions of people, all varying in nationality gather in Mecca to worship in unison.