The Kaaba dates from very ancient times. Some (Peter Tompkins) think it was originally a geodetic marker, a Navel. Others exist, Delphi is also a possible Navel.
The folks in Arabia have always considered the Kaaba sacred but apparently forgot why.
The second is the Dome of the rock in Jerusalem. Abraham was there ....1800 BC.
Abraham's home town of Ur was a coastal city when he lived there. It is presently almost 100 miles from the water.