The Catllaràs chalet is located in the mountain range of the same name above the Falgars sanctuary. This building was built to house the technicians of the coal mines that supplied fuel to the Clot del Moro cement factory. It seems that Eusebi Güell commissioned the design of the chalet from Antoni Gaudí. It was built between 1902 and 1903, at a time when work was also being done on Park Güell.

It is a rectangular building with a ground floor, first floor and attic, covered by a catenary-shaped vault on the inside and pointed on the outside. The edge of the vault acts as the ridge of the roof. The interior space is divided into six apartments, two on each floor, with a central staircase built on the outside of the building. This was semicircular in plan and concentrically arranged. It was made of stone and formed a volume that stood out on the façade. Currently the staircase is in the same place but is a light iron structure. The slopes of the arches are part of the facades in which mansard-shaped windows open, covered with sloping and slightly pointed visors. The side walls that enclose the building have few openings. There are two chimneys, one that comes out of the roof - it collected the smoke from the stoves of the different homes and the other attached to a side that served to evacuate the smoke from a room on the ground floor.

The interior of the building was very simple but it made the most of the space and sought comfort. On the ground floor there were, apart from the two homes, the kitchens and dining rooms. The space was reduced from the first to the third floor. The apartments had interior divisions, except for those on the third floor which is a single space. The staff was distributed according to job categories on the ground floor, with worse thermal insulation, which was occupied by maintenance and service personnel, managers on the middle floor and junior staff in the attic.

Although there is no document to prove it, the Catllaràs chalet is attributed to Antoni Gaudí. The architect Viladevall in issue 35 of the magazine ‘Cortijos y rascacielos de Madrid’, dated June 5, 1946, explains that Domènec Sugranyes Gras, a collaborator of Gaudí, assured him that he was the author.

This chalet was built as housing for technicians and other workers in the Catllaràs coal mines, which had a period of great activity, but finally the chalet was ceded to the City Council of La Pobla de Lillet. It is known that in 1907 the slope of the window visors was modified and the base of the building, initially covered with river pallets, was covered with cement. The villa suffered severe degradation and in 1971 renovations were made to adapt it as a summer camp.