The prayer hall arches are Umayyad-style decorations carved in the Jordanian stone. There is an out door praying area also two prayer halls for women. Hashemite History Museum is on the first floor. Read more
Note that the picture of the big minaret does not correspond to the Husseini Mosque (downtown Amman) but to King Hussein Bin Talal Mosque (Dabouq area Amman).