The Hajj

The main reason 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.
Every adult, healthy, sane Muslim who has the financial and physical capacity to travel to Mecca and can make arrangements for the care of his/her dependents during the trip, must perform the Hajj once in a lifetime.