What Sacred Object is Located in The Dome of the Rock?

This is a Grant's tomb question. The sacred object is a Rock. Not just any rock, though. It is about 200 feet long. It is believed to be the rock upon which Abraham was to sacrifice his first born son, Isaac. It was also the site of Solomon and Herod's Temples.

It is now a mosque and sacred to the Moslem world because it is believed to be the rock from which Mohammed ascended into heaven. There he met with God and Jesus Christ and received the revelations revealed in the Koran. Moslems believe that the blessed can see the imprints of Mohammed's feet on the rock.