What is the difference between mesjid al-Aqsa and the dome of the rock?

The dome of the rock is a landmark in Jerusalem it was completed in 691 whick makes it the oldest Islamic building in the world, beleived to be the spot where Muhammad ascended to the heavens

Masijidul aqsa (the fatherst mosque) is also in Jerusalem and is believed to be where the temple of Jerusalem once stood it is the place Muhammad came and prayed with previous prophets on his wat to the ascension to the heavens