Traces of how Islam originated are seen in the holy site of Kaaba in Mecca. Masjed Quba is the holiest place on Earth, which was given birth to in the 17th century. It is said to be one of the oldest mosques which over the years has expanded to accommodate the increase in the number of Muslims visiting each year. As part of one of the 5 pillars of Islam, the site has a religious importance.