Adam’s Calendar, which may be the oldest artificial structure still standing, was discovered entirely by chance in 2003. When he lost control of his jet, a South African pilot named Johan Heine was flying above the Mpumalanga region, a hilly area in the country’s east.

His jet crashed into a mountainside after being forced to make an unscheduled landing. Heine narrowly escaped injury and emerged from the plane to see three mᴀssive dolomite stones in front of him. These gigantic stones protruded from the ground, each weighing roughly five metric tons (5.5 US tons). In front of them stood a mᴀssive stone circle.

The facility is located in an isolated region, with just a few dirt roads providing access. It would likely have remained concealed if the pilot hadn’t discovered it crash-landed.

But what Heine had discovered was remarkable. The megalithic structure appeared to be a very ancient stone calendar, and it was given the name “Adam’s Calendar” in honor of its great age.

Stonehenge in Africa

The pilot had spotted what seemed to be the world’s oldest artificial building. According to some theories, the site was built 300,000 years ago, well before any other indication of human civilization.

If the monument is genuinely that old, it would rewrite human history and almost definitely necessitate the participation of a sophisticated civilization in its creation. Some have speculated that ancient aliens were involved in its construction, using this as a starting point.

An outer stone circle with a diameter of 30 meters (98 ft) surrounds the location. Several monoliths are positioned in a sophisticated design inside the ring. The site’s overall layout appears to be based on astronomical alignments, effectively turning it into a calendar.

Other constructions and stone circles surround the site, connected by several canals and created with complementary alignments. These pathways, according to researchers, are rocky roads that lead to Adam’s Calendar. These canals connect to numerous other ruins and ancient agricultural terraces in the terrain, not simply Adam’s Calendar.

Two upright stones with engravings surround the circle’s center. Many of the building materials, including these stones, appear to have been transported from afar. Although not readily visible at ground level, the original shape of this calendar site can still be seen in aerial pictures.

The usage of these materials and the apparent requirement to view the location from an elevated vantage point indicate that humans did not build it. But why was the site erected here if there was alien involvement long before civilization?

One potentially noteworthy point is the abundance of gold resources in Adam’s Calendar area. Mining shafts dot the landscape, and the Sheba Gold Mine, the world’s richest gold mine, is still located in Mpumalanga. These could have been valuable materials for whoever created the Calendar.