Pottery, flint axes and cross arrows, and amber beads have been found at Jættestuen
The special monument of the past is known under the name "Double Giant Room in Tvedeskov". But to be precise it is a twin room. Double giant rooms typically consist of two more independent mounds with some height filling between the chambers. Our giant's room, on the other hand, has only one mound containing two chambers, which in construction is almost one chamber divided in the middle of a stone.
From each of the two chambers, a passage leads to the foot of the hill. Today (with one exception) there are no capstones over chambers or passages. In this sense, the Jættestuen is missing an essential part, consisting of capstones and the infill of earth and stones that once covered them. For us today, this means that we can study the construction of the huge room here without having to crawl around in a pitch-dark room.
In 1875 both chambers were filled with earth. Even then, the capstones were missing and two parallel entrances could be seen to the south-east. Two years later, the two chambers of Henry Petersen's giant room were excavated by the National Museum for the Count at Tranekær Castle. The finds were handed over to the castle and ended up in the count's private collection. The ancient monument was re-described in 1947 and registered in 1948 as a result of the 1937 general conservation. In 1978, the chambers of the Giant's House and the area in front of the curbs at the entrances to the passageways were examined at the Langelands Museum.
Several flint axes and some Middle Neolithic pottery were found in a semi-circular area above and below a stone packing. The finds probably come partly from sacrifices in front of the corridors, partly from cleaning in the chambers. Traces have been found in many places that indicate that the chambers were cleared during the period of use of the megalithic tombs to make room for new deposits.
It is interesting that pottery from the Late Bronze Age and Roman Iron Age has also been found, and that pottery shards from an early part of the Neolithic period have also been found under the mound itself. This means that the site has been used for religious acts for millennia. After the excavation, the giant's house was restored and given its present form.
In 1995 a headstone had fallen and two supporting stones poured heavily into the chamber. A renewed restoration put the stones back on their feet and ensured stability, among other things, through the use of stainless steel rods. The dry stone walls were also restored and cleaned.
(Text & images from: "Past memories of Langeland", by Morten Gaustad)