In this hall the visitor can learn about the biography of King Abdulaziz in figure and voice including the story of recapturing Riyadh and the procession to unify the Kingdom and to extend security and stability.  The hall comprises of maps, and paintings that tell about the development of the Saudi State.  An illuminated board shows the lineage of the sands in addition to a brass plaque showing the names of the man who had accompanied Abdulaziz to recapture Riyadh.
The hall also contains a lot of old weapons, swords, inlaid with silver, coins of old times mostly minted of silver and some of gold.  The hall also contains rare avis watches, some of them bearing the name of King Abdulaziz and others bearing his photo in addition to King Abdulaziz wrist watch, some of his dresses, two Cadillac specially manufactured for him as well as a big collection of rare old mail stamps.

resource: http://www.arriyadh.com/Eng/Tourism