Muslims go to Mecca is to pray in the
Masjid al-Haram. Often, they perform the Umrah, the lesser
pilgrimage, while visiting the Masjid al-Haram. Once a year,
the Hajj, the greater pilgrimage, takes place in Mecca and
nearby sites. During the Hajj, several million people of
varying races and nationalities worship in unison.