The hajj is a pilgrimage that all Muslims are required to make once in their lifetime if they are physically and financially able to do so. It involves performing rituals in the holy city of Mecca, located in Saudi Arabia. Key rituals of the hajj include circling the Kaaba seven times, performing prayers and rituals between the hills of Safa and Marwa, and spending a day at Mount Arafat. The hajj culminates in sacrificing an animal to commemorate Ibrahim's sacrifice. Making the pilgrimage is one of the five pillars of Islam.