The Hospital del Tòrax is an enormous abandoned sanatorium on a hillside south of Terrassa, an unmistakable concrete structure visible from the motorway. Built in 1952 in a rationalist modern style with deep porches and patient terraces designed for fresh-air tuberculosis treatment, the building was at the time considered one of the most advanced TB hospitals in Spain.
It has been used as a filming location by Spanish horror directors — most famously Jaume Balagueró's REC (2007), where it stood in for the building besieged by infected residents. Public access is officially forbidden, but the exterior can be photographed from the road. Plans to convert the site to a justice ministry complex have been talked about for years. For an urban explorer, it is one of the more striking abandoned modern buildings in Catalonia.