Tour de Villers, Medieval fortified tower in Centre Quarter, Belgium

The Tour de Villers is a semicircular tower of rough sandstone rubble, with a lower section of thicker ferruginous sandstone blocks that formed its foundations and now stands above ground. Its outer face has two levels of arrow slits and a crenellated parapet, each merlon pierced by a small loophole. Beside it, the Villers curtain wall keeps its buried foundation arches, now exposed and bricked up, and the walled-up windows of houses once built against it.

The tower and its adjoining wall were built in the 13th century as part of Brussels's first city wall under Duke Henry I of Brabant. Over time they were absorbed into private buildings, and in 1893 they were rediscovered inside a cabaret. The houses were demolished in the early 1960s, after which architect Jean Rombaux restored the tower, rebuilding its platform and arrow slits. It was listed as a protected monument on 30 March 1962.

The tower is also called Cellebroerstoren, and originally Sint-Jacobstoren, after Saint James. In 1893 the tower and wall were "rediscovered" inside a cabaret that had absorbed them; the wall's lower level still shows bricked-up foundation arches and the blocked windows of houses once built against it.

The tower has two faces: the extra-muros side is seen from the courtyard of the Sint-Jorisinstituut at Rue des Alexiens 16, the intra-muros side from Rue de Villers. Both are street-level views of a structure that is not open to climb. The adjoining courtine collapsed over 20 metres in November 2018 and is being rebuilt with its original stones.

In 1893 the tower and wall were "discovered" inside a cabaret, having been fully absorbed into neighbouring buildings over the centuries. The tower escaped the collapse of the adjoining 20-metre section of wall on the night of 17–18 November 2018, when works in the Sint-Joris school courtyard brought it down.