One of the oldest continuously inhabited cities in the world, Aleppo preserves remnants of more than four millennia of Near Eastern history. The Citadel of Aleppo is a densely layered microcosm of this long and complex history. https://www.wmf.org/project/citadel-aleppo

The Great Ummayyad Mosque remains one of the great symbols of the glorious period of Muslim civilisation and its pride. It is a master piece of architectural ingenuity having a decisive influence on the maturity of mosque architecture all over the Muslim World. http://www.muslimheritage.com/article/great-ummayad-mosque