Hajis are once-a-year travelers who make a pilgrimage to Mecca, Saudi Arabia. The Hajj is an Islamic religious duty that must be carried out at least once in a lifetime by all adult Muslims who are physically and financially capable of undertaking the journey. During the Hajj, pilgrims perform a series of rituals, including walking seven times around the Kaaba, the holiest site in Islam, and visiting the nearby hills of Safa and Marwah.