Château Mondron, Industrial heritage site in Jumet, Belgium.

Château Mondron is a large red-brick mansion with a steep grey slate roof, three storeys above a low stone base, and white stone bands between floors. Its central section is set slightly forward with columns and a balcony; dormer windows and brick chimneys punctuate the roof. A separate wing with a pyramidal grey roof stands on the left, and a round brick turret with a conical grey roof and finial on the right. The building contains 47 rooms over five levels and a consecrated chapel.

A coal and glass manufacturer named Valentin Lambert commissioned architect Elie Piérard to build this estate in 1881 as a symbol of his wealth. Three decades later, it was transformed into a church in 1930, changing its purpose completely.

The parish of Saint-Lambert was created inside the former mansion, and its first priest, Abbé Duray, served for twenty years, founding Patro sections, a Christian Workers' Youth cell and a choir. Around 1935 a particular devotion to Saint Rita began here. The stained glass in the choir, with floral motifs, came from the castle's old entrance hall.

The grounds are surrounded by a large park that helps you get your bearings when exploring the location. The building is now a housing project rather than a museum, so visiting options are limited, but the exterior architecture and estate grounds are accessible from the outside.

The stained-glass windows with floral motifs in the church choir came from the castle's former entrance hall. They contrast with the other windows of the building. The church, built in 1930-1931 by architect Edgard Clercx, has no columns and is lit by these windows.