Until 1965 Radnor Gardens was in two parts, divided by a stream, effectively a parallel creek of the River Thames. And did you also know that a bridge helped you cross to the island gardens. Over time the stream (or parallel creek) became silted up and was finally filled in so that the whole space could become one big garden.
The bridge was actually left in place and the top of its structure can still be seen marking the edge of the footpath leading down from the entrance to the gardens.
Go check it out.