A professor of archaeology at the University of Oxford discovered around 400 mysterious stone structures on and around volcanoes in Saudi Arabia.
Many of the gates sit atop ancient lava domes—dried mounds of lava found near volcanoes. Scientists think they can get a more accurate idea of the age of the gates by analyzing the lava. Traces of lava are on the gates themselves. The volcanoes in the region are currently inactive.
According to The Independent, the gates are known to the Bedouin people as “Works of the Old Men.” This isn’t the only region where structures like these have been discovered in the Middle East, but is the most unique. Part of the reason is the difference in size of the various gates and their positions to each other. The longest one is 1,699 feet while the shortest is about 43 feet. Some of the gates are miles apart in distance while others are nearly touching.
Kennedy said, via the Express, that they “appear to be the oldest man-made structures in the landscape,” and that ”no obvious explanation of their purpose can be discerned.”
The studies of structures like these in the Middle East have occurred almost exclusively through satellite imagery. Actual field study is needed to further unravel the mystery, but a remote, inhospitable environment ensures archaeologists have their work cut out for them.