Actually, it's important to understand what Al-Aqsa is anyway. It an important and historic site in Jerusalem and sacred to all three of the Abrahamic religions (Judaism, Christianity, and Islam). It is a UNESCO world heritage site.
Even more importantly this mosque is under attack, as is Christianity.
My ancestors probably participated in the Crusades, but I feel as strongly about Al-Aqsa as I do about Notre-Dame in Paris. I've been to Notre-Dame, but I have never been to Al-Aqsa. I would probably have stronger feelings about Al-Aqsa if I saw its splendour in person. It is a part of the world's heritage that needs to be preserved.