NASA has released new pictures of huge patterns drawn on the ground in Kazakhstan in an attempt to solve the mystery of who built them and why.
The designs, ranging in size from 90 to 400 metres, include crosses, squares, rings and swastikas.
Scientists still have no idea how the mystery formations, known as the Steppe Geoglyphs, were formed.
It’s been speculated that the strange structures may have been used by Stone Age tribes to perform ancient rituals or to track the sun.
However, scientists had previously believed that such early populations had neither the time nor the organization to build and dig the huge symbols.
“The idea that foragers could amass the numbers of people necessary to undertake large-scale projects – like creating the Kazakhstan geoglyphs – has caused archaeologists to deeply rethink the nature and timing of sophisticated large-scale human organization as one that predates settled and civilized societies,” Persis B Clarkson, an archaeologist at the University of Winnipeg, told the New York Times.
Take a look at other incredible ancient megastructures below.