El Zanjón de Granados, Archaeological site and tourist attraction in San Telmo, Argentina.
El Zanjón de Granados is an underground complex beneath a restored mansion from the 1830s in San Telmo, Buenos Aires. The site features a network of brick tunnels, water tanks, and archways that connect different levels of the excavated space.
The complex was discovered during the 1980s renovation of the mansion on the property. The structures date back to the colonial era and reveal how Buenos Aires managed water systems in its early development.
The site reveals how residents managed water and adapted to urban life over centuries in Buenos Aires. Walking through the tunnels, you see the layers of how people organized their daily lives across different eras.
The site is accessible only through guided tours, as it is a protected archaeological excavation. Tours are offered in multiple languages and reservations are recommended in advance.
The excavation revealed an original stream called Tercero del Sur that once flowed from Plaza Constitución towards the river through the neighborhood. This underground watercourse was a vital part of Buenos Aires' water system before the city expanded and built over it.
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