googling sent me to megalithe.be where I found:
2.7. The enigmatic monument of Forrières
(Nassogne, province of Luxembourg).
A strange group of eighteen sandstone boulders formerly stood at Forrières, 1.6 km from the Lamsoul allée couverte. According to mid-19th century observations, the group was composed of six ‘trilithons’ roughly forming a circle. The only excavations ever carried out yielded no information about the plan of the structures or their cultural attribution. The site was often regarded as the ruins of a dolmen; then, later on, reverting to the previous hypothesis, as a ‘stone circle’ evocative of Stonehenge. Even the date of the construction is quite uncertain although it has often been attributed to the Bronze Age
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