When Abraham was over 100 years old, he was asked to climb Mount Moriah with his son Isaac, there to sacrifice his son. It was a huge challenge for this aged man, and for his younger son, because all the promises about his descendants depended upon Isaac having children, and thus continuing Abraham’s family line. But Abraham obeyed without question, confident that God would keep His word and, if necessary, that He would raise Isaac from the dead (see Genesis 22:5 and Hebrews 11:17-19).
Modern scholarship is uncertain about the actual location of Moriah. However, many believe that Moriah was the location of Solomon's temple and, today, the location of the Muslim "Dome of the Rock".
I hope that helps,