the kaaba, cuboid structure located within masjid al-Ḥarām (sacred mosque) in mecca, saudi arabia, according islamic tradition rebuilt ibrahim (abraham) , son ismail (ishmael), , 1 of holiest places in islam. during life prophet muhammad laid black stone in 1 of corners of building. many millions of muslims visit mecca , surrounding areas each year during pilgrimage known hajj – fifth , final pillar of islam – during circumambulate kaaba part of ritual. other significant areas within or surrounding mecca include areas in hajj takes place, including of zamzam, mina , bridge, muzdalifah , mount arafat. the second holiest place muslims masjid al-nabawi in medina, prophet muhammad buried under green dome. caliphs umar , abu bakr said buried in masjid al-nabawi. al-aqsa mosque in jerusalem sacred place in sunni traditions site muhammad ascended heaven in isra , mi raj , first qibla. mount sinai holds significance in islam. among shias, imam ali mosque , imam husayn shrine hold high...