It is the demonstration of the solidarity of the Muslim people, and their submission to God. It involves financial sacrifice and is an act of worship. Muslims must make the pilgrimage the first half of the last month of the lunar year. The Kaaba is a large cubical building located inside the grand mosque known as al-Masjid al-Haram in Mecca, says M3 DS Real Saudi Arabia. The mosque was built around the original Kaaba. The Kaaba is the holiest place in Islam. The quibble, the direction Muslims face during prayer, is the direction from their location on Earth towards the Kaaba.