Mada'in Saleh is currently closed for ... getting ready for tourists? It says "closed for development" and the guide told me they will open it up for the general public sometime in 2020 but most of the places were available for visit with a few "renovation" piles of lights, planks, etc, and some areas are maybe off-limits and I didn't notice. A true marvel to visit nonetheless and harsh for them to close this off entirely. Comes to show that the Kingdom currently does not give a **** about tourism. However, you CAN visit if you are with a guide. They will arrange a visit for you and then it's even better because none of the visitors are here to spoil the fun - so maybe NOW is the time to try and visit?!
Stay overnight at Al Ula, the closest town with hotels. It is a long drive from Medina and you want to be here in the morning for the first light. All the rock formations and structures will be desert red and if you love taking photos you will love the first half an hour of light. Our tour started at the south gate which needs a 4WD going through the desert roads and ends up at the north gate.
All the tombs show marvelous carvings by the Nabataeans whose capital is Petra. To think it was done over 2000 years ago. Before coming the Qasr al-Farid is the main thing to see, and it remains the most photogenic due to its freestanding large sandstone boulder but little did I know it was unfinished.
Now that I think about it it seems a sin to keep this closed to the public.