The distinctive features of the Islamic architecture are seen in the standardized architecture of the mosque and the mausoleum. The mosque consisted of a large, rectangular open courtyard surrounded by arcades on all four sides. The mehrab which faces Mecca indicates the direction to the prayer. The call to worship was made from a tall tower or minaret. There were many minarets in some mosques. The arch in the gateway and other places was another characteristic feature. The dome was another prominent feature of the mosque and the mausoleum. The ancient Indian buildings were decorated with beautiful carving and sculpture white the Muslim buildings were marked by simplicity and lack of a adornment. The two styles were gradually synthesized into a new and unique style.