Just by Qasr Marid lie the old mud town together with the rehabilitated mosque of Omar and the Minaret.
It is said that this mosque was previously a worship place (possibly a church) for christians.
The fortress of Qasr Marid was built in Nabataean times, and maintained its importance due to the town's strategic spot on several trading routes.
The Mosque of Omar is one of the oldest in the kingdom, and is said to have been founded in the mid-seventh century. Because it's still in use, it has been extensively renovated over the centuries, but this also means non-Muslims can't enter the building.