D15

Großsteingrab Loon is a megalithic passage grave in Loon, a district of Assen in the Dutch province of Drenthe. It is also known as D15, its van-Giffen number. The monument lies north of Loon where a field path meets the Heirweg, with Großsteingrab Balloo (D16) 2,5 km south and Großsteingrab Gasteren (D10) 3,7 km northeast.

The grave is aligned east-southeast to west-northwest. Its oval stone enclosure remains in good condition: 18 of the original 23 stones survive. The burial chamber is 9,6 m long and about 3,6 m wide, with five pairs of side stones, one closing stone at each short end and five capstones. Four capstones remain in place, while the middle one lies broken inside the chamber. A short entrance passage leads to the chamber.

The monument belongs to the western group of the Funnel Beaker Culture and is dated by typological estimate to 3500–2800 BCE. It was first mentioned in 1654 by A. van Slichtenhorst, excavated by Johannes Hofstede in 1809, and restored in 1870. Later work included archaeological investigation and restoration in 1952, further restorations in 1965 and 1993, and inclusion in a 3D atlas using photogrammetry in 2017. It has been a National Monument since 1992.

The remains include cremated bones from a man, a woman and a person of uncertain sex, all of whom died in adulthood. A 1974 robbery excavation also found two Bell Beaker vessels and a small piece of copper or bronze, 4,5 cm long and 3,5 cm wide. These objects are now in the Drents Museum. Reuse of megalithic tombs by later communities is common in the Netherlands, where monuments of this kind were built by the Funnel Beaker Culture.

D15 is a dolmen in Assen, Germany. Wikidata describes it as: dolmen in the Netherlands. A typological estimate: 3500 BCE to 2800 BCE. No English Wikipedia article exists for it; the full text below is the German article "Großsteingrab Loon", shown in the original language.