In case of this TWHS, the road taken was even more interesting than the actual site. We saw the burial tumuli of Al-Ayn and then decided to drive the shortest way possible to Al-Rustaq. Long story short, don't. The road seems to be okay for a while and then it gets worse before getting abysmal. 4WD would have been better, as the road gets bumpy and dusty, but at least you can catch glimpses of some unique local places. Anyway after a bumpy ride we arrived and parked our car by the fort. It was Friday, so it was closed in the afternoon, therefore we opted for the next best thing and walked around it. It's huge. If you've seen some other places of the Omani irrigation system WHS, this one has some too: there's a visible aflaj around, oasis and some wells.