The Qasr al-Farid tomb, or "lonely castle," so named as it is completely isolated from the other tombs, was pretty spectacular. It rises four stories in height and was cut into a sandstone outcrop. This tomb was left unfinished but is the most iconic sight of Mada'in Saleh. 

Mada’in Saleh is one of Saudi Arabia’s two UNESCO World Heritage Sites. The city was settled by the Nabataeans, whose capital was Petra in Jordan, in the first century B.C., and most of the 131 rock-cut tombs date to the first century A.D. 

Two more view of this magnificent tomb: 

 

We traveled to a valley in Al-‘Ula famous for its ancient lion tombs, so called because of the lion figures cut into the rock above some of the tombs. This is a cropped image as we didn’t walk up to the tombs since we were told we only had 15 minutes here, and it was much farther than it looks in the image below. To the left of center are some rectangles cut into the rock; the figures are lions. 

“Located a short distance north-east of al-Ula, on the cliffs within the valley in an area known as al-Khurayba, these tombs are evidence of 2,600 years of settlement in al-Ula, originally called Dedan. They are known as al-Aswad Tombs and were carved around the 6th century BC by the Lihyanites, the people who inhabited the oasis and created the powerful Kingdom of Dedan. The numerous tombs are mostly plain burial chambers carved into the rock, but a small number of them have lion sculptures above them. ... These tombs have become a symbol of al-Ula's ancient past.”

Sort of a natural amphitheater surrounded by very high rock formations

PS

Aramaic, it is very similar to Hebrew, and it derived from it. It has the same alphabet or Aleph Bet of the Hebrew language and it was used before and during the time of Jesus, and it is said that was created so that the evil angels will not be able to read it or understand it, because they had already learned Hebrew.

Only the words were changed, but not all of them