On either side of Victoria Park’s Cadogan Gate entrance, you can see, and sit within, a part of Old London Bridge. Bridges have crossed the Thames in the same area of London for millennia, at least since the Romans constructed a wooden crossing in the first century. The longest-standing “London Bridge” lasted from 1209 to 1831, and over the centuries hundreds of houses and shops were built upon the bridge, to such an extent that some buildings lent into the middle, forming a sort of tunnel, while others overhung the…