Forest Abbey is a Benedictine Abbey founded in 1105, beside a creek, a tributary of the Zenne, southwest of the city of Brussels. The abbots of Affligem, which had been the ecclesiastical owners of the parish since the bishop of Cambrai ceded it to them in 1105, decided to build a priory for women in Forest, Forest Abbey. The first abbess of the Forest priory was named in 1239. Also in the 13th century, the Romanesque church of Saint Denis was rebuilt in the newer Gothic style. The neighbouring abbatial church was rebuilt in the 15th century.
Relics of Saint Alena, whose cult was popular in the region, were formerly kept both in the parish church and in the abbey church, but since 1796 only in the parish church.
Much of the abbey was destroyed by fire on 26 March 1764. The abbey was suppressed on 8 October 1796 and sold the following year. The buildings that survived the dismantling are now a cultural center for seminars, banquets and exhibitions, owned by the Brussels municipality of Forest.
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The Broch of Gurness is an Iron Age broch village. Settlement here began sometime between 500 and 200 BC. At the centre of the settlement is a stone tower or broch, which once probably reached a height of around 10 metres. Its interior is divided into sections by upright slabs. The tower features two skins of drystone walls, with stone-floored galleries in between. These are accessed by steps. Stone ledges suggest that there was once an upper storey with a timber floor. The roof would have been thatched, surrounded by a wall walk linked by stairs to the ground floor. The broch features two hearths and a subterranean stone cistern with steps leading down into it. It is thought to have some religious significance, relating to an Iron Age cult of the underground.
The remains of the central tower are up to 3.6 metres high, and the stone walls are up to 4.1 metres thick.