The Three Chimneys. Located in Sant Adrià de Besòs near Barcelona, they represent a monumental testament to Catalonia's industrial heritage. These towering structures, part of the former Besos thermal power plant, have stood as silent witnesses to the region's technological and economic transformation since the mid-20th century. Rising over 200 meters high, these brick and concrete giants dominated the industrial landscape, symbolizing the area's energy production era. Although the power plant ceased operations, the chimneys remain a powerful landmark.