Similar to Nazca Lines in Peru, ancient geoglyphs are visible from air across a desert that is spread between Syria and Saudi Arabia.
Believed to be at least 2,000 years old, the structures were discovered only after airplanes flew over them.
One must ascend to at least 30 meters (100 ft) to view the structures clearly.
Purpose of the structures is unclear. Some are clustered together, and others stand alone.
Some of the circles seem to have spokes aligned with astronomical phenomena, while others are apparently random. They could be the remains of buildings or cemeteries, though the most common belief is that they had some sort of religious significance to the people that made them.
The area near the Azraq Oasis a little south of Azraq ed Duruz, Jordan (east of Amman)
has hundreds circular structures made of stone that date back at least 2,000 years old and perhaps even 9,000-years-old.
These wheel structures are often found on lava fields and range from 82 feet to 230 feet (25 meters to 70 meters) across.
The circular structure of lines radiating from a central point like spokes go out to “wheel” edges that are so low that none of the patterns can be seen from flat ground, only from the air.
There are hundreds of these across the Harrat ash-Shaam of Jordan, and the numbers
possibly exceed 1,000. The patterns in stones also extend into Syria and Saudi Arabia.
A Wheel typology (above) has been constructed for the basalt area of Jordan based on several defining features: the type or absence of a central hub; number and straightness of the dividing spokes or walls; presence or absence of Cairns within and/ or surrounding the main internal structure; shape of the main structure; and external wall features. Size is another defining factor. Each of the below features appear in many different combinations and configurations. So far, the types do not seem to have regional differences within the basalt, but there seems to a greater number of them in the southwest and central basalt.
Generally, the structures are built on slopes or hills and grouped together, particularly in areas with a heavier basalt cover, like Azraq, Safawi and Aritein. There does not seem to be a particular pattern to their type when grouped in such a way, as there is large variations in size and shaped, as well as defining features across the clusters.
Few circles and spokes are similar to the Mysterious Voynich manuscript, which is undeciphered to this day.