
Hajj is a very personal journey for many Muslims. It is meant to be a once-in-a-lifetime experience, and every Muslim is meant to make the pilgrimage once in their life. Pilgrims come to pray near the holy city of Mecca. It takes place once a year. But in order to enter the kingdom of Saudi Arabia, several vaccinations are required for each person coming in. It is estimated that around 2-3 million people make the annual trip.