Mihrab is considered as the most holy place in a mosque. A mihrab is usually a niche set into the middle of the qibla wall of a building in order to indicate the direction of Mecca. The earliest mosques do not appear to have had mihrabs and instead the whole qibla wall was used to indicate the direction of Mecca.
Mihrab was probably introduced in the 3rd century of Islam, in the 9th century. It is an element added to the mosque of architectural reasons and can be made of wood, but is normally made out of masonry, and adorned with pillars.
