Hekeser Steine

First of all, it was nature or the climate. There were and are no geological deposits of these huge stones in the region. So they all come from Scandinavia. The ice of the Ice Age pushed them in front of it and also crushed them. That is why there are also smaller stones next to these huge stones, which are still carried out of the ground when ploughing today. In the past, they were also used to build roads - the well-known cobblestones.

But it's true, lifting and assembling these huge stones on site without machines is impressive from today's perspective. That's why people believed they were giants who did it. So today they are also called "Hünengrab" in German or "Hunebedden" in Dutch. A Hüne oder Hune (Middle High German: huine; Low German: hûne) is a term for a giant (human). You can also find this word in the English "huge".

Everything else is just physics ;-)