Project proposes to turn Basel’s underground river, Birsig, into a linear botanical garden,hidden underground, but open for public. Historically Birsig was a river, running through Basel’s city center. Today it is chanelled in an underground stone tunnel. Project adds lights, hydroponic techology and heaters to tunnel’s contained microclimate and creates warm and humid atmosphere where lush botanical garden will grow. Hidden Park will serve as a place for romantic walking, botanical explorations or transit on a rainy day.

Important: closed shoes with non-slip soles are required

Meeting point and start of the tours: under the Heuwaage viaduct (Steinenvorstadt 78)