Madrid Metro Expansion Uncovers 16th‑Century Royal Canal, Sparking Preservation Debate

Construction work to extend Line 11 of the Madrid metro in the Arganzuela district has uncovered roughly 30 metres of the historic Canal de Manzanares. The well‑preserved sections include wooden beams and brick fragments that date back to the 16th‑century project initiated by King Philip II and later extended under Charles III, intended to link Madrid with the Tagus River and the Atlantic.

Local heritage groups say they warned authorities about the possible existence of the canal as early as 2023, but the concerns were not reflected in the original route plan. Archaeologists, led by Esther Andreu, are documenting the finds and using laser scanning to monitor the site before construction can resume. The discovery has reignited debate over how to balance major urban infrastructure projects with the preservation of buried cultural assets.