"Europe's Oldest Megastructure: Stone Age Wall Discovered in Baltic Sea"

A stone age wall, named the Blinkerwall, discovered at the bottom of the Baltic Sea near Germany's coast, may be Europe's oldest known megastructure, potentially built more than 10,000 years ago by hunter-gatherers to create a driving lane for hunting herds of reindeer. The 971-meter-long wall, covered by 21 meters of water, consists of nearly 1,400 smaller stones connecting larger boulders, suggesting intentional construction. Researchers believe it was submerged with rising sea levels about 8,500 years ago and are eager to revisit the site to search for animal bones and human artefacts.