Magdalenenberg

Magdalenenberg is the name of an Iron Age tumulus near the city of Villingen-Schwenningen in Baden-Württemberg, Germany. It is considered the largest tumulus from the Hallstatt period in Central Europe with a volume of 33.000 cubic meters.

The central tomb, where an early Celtic Prince (Keltenfürst) was buried, has been dendrochronologically dated to 616 BC. The mound, which is still distinctly silhouetted against the landscape, once possessed a height of 10–12 m (now about 8 m) and a diameter of 104 meters. Little is known about the people who erected it, and current research focusses on the identification of their settlement.[1] In the decades after the Prince's death, 126 further graves were mounted concentrically around the central tomb. At around 500 BC, this tomb was plundered by grave robbers, whose wooden spades were later found by archaeologists.
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From 1970 to 1973, the archaeologist Konrad Spindler led another scientific exploration, now not only focussing on the central tomb, but on the surrounding graves as well. By excavating the whole hill, all 127 graves could be explored and finds like bronze daggers, spearheads, an iberian belt hook and a precious amber necklace were unearthed. Some of those objects are proof for trade connections to the Mediterranean area and the eastern alpine region, others allow rare insights into the Celtic burial rites. They are now on display in the Franziskanermuseum (Franciscan Museum) in Villingen, along with the Prince's wooden burial chamber (one of the largest wooden objects from the era in any museum).
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Since 2011, the Magdalenenberg attracted new international attention as the possible site of an early moon calendar. The archaeologist Allard Mees of the Romano-Germanic Central Museum (Mainz) suggested that the alignment of the graves represents the stellar constellation at the time of their erection. Another part of his theory is based on large wooden poles that were found inside the hill and whose function remains a mystery. He interprets them as markers directing to the position of the lunar standstill, thus allowing the Celts to prognose lunar eclipses.[2]
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https://en.wikipedia.org/wiki/Magdalenenberg
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https://journals.ub.uni-heidelberg.de/index.php/jahrb-rgzm/article/viewFile/17008/10823