Amman, Jordan. The entrance of the Citadel. Jabal al-Qal'a, also called Amman Citadel is a national historic site at the center of downtown Amman, Jordan. Known in Arabic as Jabal al-Qal'a, the L-shaped hill is one of the seven jabals that originally made up Amman. Evidence of occupation since the pottery Neolithic period has been found, making it among the world's oldest continuously inhabited places.