Our tour guide gave us a choice. We could choose to see the Kerak castle or the Montreal castle. As a group we chose the Montréal castle.
The Montréal or Shobak Castle in Jordan is less impressive in appearance but is famous for its tunnel system out to the road (which we were not able to use).
Montréal is a Crusader castle on a rocky mountain. The ruins, called Shoubak (Arabic: الشوبك), are located in modern town of Shoubak in Jordan.
The structure is not massive but it is interesting to visit. They are busy reconstructing it from the ruins.