Some of the old city's historic structures include: Salwa Palace - the residence and first home of the Al Saud. It is considered the largest palace on the site, rising four stories high and is composed of five main parts built at different consecutive periods of time; Saad bin Saud Palace - which is completely restored and several stories high; the Guest House and At-Turaif Bath House and the Imam Mohammad bin Saud Mosque, which was built during the reign of Imam Mohammad Bin Saud. __