Al-Ukhaydir Palace in Iraq is considered one of the architectural monuments that best represents the age it was built in. It combines Sassanian, Byzantine and Turkish influences in an unprecedented manner. The article has a complete architectural description, including the walls and defensive alleys. (Taken from English summary on page 9)
Ibrahim, Abdelbaki Mohamed (ed). 1998. Al-Ukhaydir Palace. In Alam al-Bina. Cairo: Center for Planning and Architectural Studies, 29-31/204.