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The megalithic tombs, located in Poland, are likely around 5,500 years old.
https://www.popularmechanics.com/science/archaeology/a65383604/poland-trapezoid-pyramids/
https://archaeologymag.com/2025/07/5500-year-old-polish-pyramids-western-poland/
This is a very recent discovery, so there is not much information around on this site.
https://www.popularmechanics.com/science/archaeology/a65383604/poland-trapezoid-pyramids/
Discovered by a team from Adam Mickiewicz University using advanced remote sensing technology during routine field work, the team uncovered “mysterious ground embankments” before confirming them as long earthen tombs constructed during the Funnelbeaker culture of the Neolithic age, according to a translated statement from the Landscape Parks Complex of the Wielkopolska Voivodeship. To locate the tombs after the initial discovery, archaeologists employed aerial laser scanning followed by on-the-ground excavation.
Known as Polish pyramids—or “beds of giants”—the tombs located at the General Dezydery Chlapowski Landscape Park form an elongated trapezoid, with some stretching as long as 656 feet. This particular style of construction has the east end wider and taller than the west, creating a triangle shape or tail-like design from the tomb. Experts believe the use of the trapezoid shape is tied to the style of houses once used by nearby Neolithic cultures, according to the Polish Press Agency.
. . . . Each tomb was typically covered with cobblestones and massive boulders were placed in front, some weighing as much as 10 tons, a show of the culture’s intricate teamwork and tool know-how to make happen.
https://archaeologymag.com/2025/07/5500-year-old-polish-pyramids-western-poland/
This is a very recent discovery, so there is not much information around on this site.