A stone humpback bridge over a narrow canal. A towpath wide enough for a horse towing a boat emerges from under the bridge, from left to right, but then almost immediately the path starts ascending a steep stone ramp, going back on itself from right to left, over the bridge into the foreground of the picture, then from left to right again, travelling in the same direction but now on the other, nearer, bank of the canal.
Somebody on the boat would be able to unhitch the tow rope if necessary, while the horse is led from one bank to the other. I kinda want to see the horsemanship involved. Presumably somebody guides it on the ramp.
All the stone surfaces are rounded and mossy, and the photo composition describes an organic spiral.
There are, unaccountably, no horses visible, but two humans are posing for the camera on the opposite up ramp.
Wikipedia: https://en.wikipedia.org/wiki/Roving_bridge
@archaeohistories #Alt4You, and so my friends can enjoy it