Abandoned railway tunnel abandoned in the dangerous expanse of Franco's era

Hidden in the Cantabrian Mountains, the unfinished Engaña Tunnel stretches 6,976 meters, connecting the provinces of Burgos and Cantabria. It was part of the proposed Santander–Mediterranean railway line, a dream project of Spain's dictator General Franco during his dictatorship era to connect the Bay of Biscay with the Mediterranean Sea. The Engaña Tunnel, constructed by separate companies 'Ferrocarriles y Construcciones ABC' and 'Portolés y Cía', is a testament to the political ambition and the human cost involved in such projects.

Hundreds of workers, including Republican prisoners, toiled for years to construct the tunnel, yet it was never used for its intended purpose. The tunnel's construction halted due to political and financial reasons, leaving behind an unstable and dangerous passageway.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons