The Khasab Castle
As far as castles and forts in Oman that teach you about what life was like in the area when the castle was built, Khasab Castle is a clear winner. There are lots of neat exhibits with signs in English, both indoors and outdoors, and kids love running around and exploring. There’s also a nice, clean bathroom.
Cannons at the main entrance
The shepherdess on the Salmah Plateau that almost threw a rock at our car was carrying a jirz!
The courtyard inside the castle
A rock house (explained here) and a summer house
A not-at-all-creepy exhibit inside the castle
The bathroom is handicap-accessible!
The central keep and palm trees
The view from the castle walls
According to Athena 