Torre Fossada (El Telègraf) is a square tower standing above the Llobregat river pass near the Devil's Bridge in Castellbisbal, Vallès Occidental. Originally a medieval military stronghold, the visible structure dates to the mid-19th century and once served as tower number 4 on the Barcelona-Lleida optical telegraph line, communicating with towers at Molins de Rei and Esparreguera. The roughly 7-meter-tall tower features a sloped base, two floors, and a surrounding moat; it gained prominence during the Spanish Civil War as a republican defensive position controlling the Llobregat crossing.
