I suspect that the metalwork you see to the right here is part of a supporting – retaining wall meant to keep that side of the canal wall, and street / sidewalk to that side of the canal, from collapsing. Readers may be aware that the city is investing huge sums in steadily reinforcing and rebuilding some of the oldest (many hundreds of years) canal walls in the center of the city. Many of those oldest central canals have significant areas at risk of subsidence or collapse, since they were never built to sustain the weight of tour buses, trams, trucks and tourists who now flock to the lovely city. This was the first time I’ve noticed such a support anywhere, and I couldn’t tell if this was an intentional garden or just whatever nature allowed to land and grow there…
(so much world, so little time....) 
If the guide on our canal tour is correct those are indeed reinforcements/retaining walls.
November 25, 2022 at 17:51