Al Musmak Castle, Riyadh

Musmak Castle was built in 1865 and lies in the heart of old Riyadh. In the center of the castle there is a diwan (or sitting room); there is also a courtyard with a well.The castle is amazing and made only of mud and straw. Its beautiful inside and really cool... so good to get inside out of the heat. Just across the way is 'chop chop square' which was really weird to walk across knowing that it's where they chop heads off... only on a Friday after prayer time ! We were okay ...we were there on a Saturday.
A little more information:
"The castle is next door to the National Museum so worth a visit in conjunction with the museum. The castle is representative of the march and battles which led to the formation of Saudi Arabia as it is known today. The castle is well preservered and provides authentic glimpses into the life and history at the beginning of Saudi Arabia. Again, like the National Museum one should check on the hours due to the differing visiting times for men, woman and families. Admission to the castle is free of charge." Source: American Bedu blog