In the Middle Ages, Den Dool castle served as a summer residence for the abbots of the Abbey of Sint-Truiden. The first mention is from 1282. Around 1340 the first abbot, Amelius van Schoonvorst, was there as a refugee during the wars of Liège against prince-bishop Engelbert van der Mark. In 1361 the castle and farm were burned down by knight Hendrik van Halbeek. The castle was restored between 1443 to 1470. and again in 1522. It became a fortified mansion with a ring wall with towers and a deep canal.
Further enhancements were carried out by Abbot Hubertus van Sutendael (1638-1663), who had an entrance gate built in 1621 and a castle chapel in 1649. The complex was transformed in a classical style in the 18th century.
Den Dool was occupied by German soldies in the first and second World Wars causing damage to buildings. Since 1994, De Dool Castle Brewery has been located in the farm of the castle. Various restoration work was carried out in the following years.
Roman Walls of Lugo are an exceptional architectural, archaeological and constructive legacy of Roman engineering, dating from the 3rd and 4th centuries AD. The Walls are built of internal and external stone facings of slate with some granite, with a core filling of a conglomerate of slate slabs and worked stone pieces from Roman buildings, interlocked with lime mortar.
Their total length of 2117 m in the shape of an oblong rectangle occupies an area of 1.68 ha. Their height varies between 8 and 10 m, with a width of 4.2 m, reaching 7 m in some specific points. The walls still contain 85 external towers, 10 gates (five of which are original and five that were opened in modern times), four staircases and two ramps providing access to the walkway along the top of the walls, one of which is internal and the other external. Each tower contained access stairs leading from the intervallum to the wall walk of town wall, of which a total of 21 have been discovered to date.
The defences of Lugo are the most complete and best preserved example of Roman military architecture in the Western Roman Empire.
Despite the renovation work carried out, the walls conserve their original layout and the construction features associated with their defensive purpose, with walls, battlements, towers, fortifications, both modern and original gates and stairways, and a moat.
Since they were built, the walls have defined the layout and growth of the city, which was declared a Historical-Artistic Ensemble in 1973, forming a part of it and becoming an emblematic structure that can be freely accessed to walk along. The local inhabitants and visitors alike have used them as an area for enjoyment and as a part of urban life for centuries.
The fortifications were added to UNESCO"s World Heritage List in late 2000 and are a popular tourist attraction.