Geograph - photograph every grid square

The boundary of the City of Nottingham is marked with over 20 cast iron markers in a distinctive semicircular form with rounded top. The majority date from the expansion of the city in 1933, but there are a number of older ones, including some delineating parish boundaries between different Poor Law boards in the 19th century. The earliest is dated 1849.
The markers include a number erected by Carlton Urban District Council, generally as a twin to a Nottingham one, although in many cases the twin has disappeared.
Overall nearly 50 locations are shown on OS maps, but a number have disappeared and the existence of others is difficult to ascertain as they are located in private gardens, etc.