Chapel of the Knights of Malta, from Ponte Sublico, Rome
Photograph by David Hill, taken 11 April 2015, 15.43 GMT
Turner was obviously trying to work out some way of getting a view from the terraces of the Aventine. It is quite frustrating from this angle. All of the terraces in Turner’s day were private (most still are) and there is in any case no direct access up onto the Aventine from this corner.