Geograph - photograph every grid square

Originally there were only four entrances (or Gates) into the walled city i.e. Bishop's Gate, Shipquay Gate, Ferryquay Gate and Butcher's Gate - arranged in a cross pattern with the Diamond as its centre. Later were added New Gate (1789), Castle Gate (1803) and Magazine Gate (1865). The original Gates were themselves re-built in the 18th and 19th centuries.

In the United Kingdom, a scheduled monument is a 'nationally important' archaeological site or historic building, given protection against unauthorised change.
There are about 20,000 scheduled monuments in England representing about 37,000 heritage assets. Of the tens of thousands of scheduled monuments in the UK, most are inconspicuous archaeological sites, but some are large ruins.
Wikipedia: Link

War memorials were mainly constructed after WWI to commemorate the troops who gave their lives in the war. Many were then updated after WWII. Some war memorials date back to the Boer War. Almost every town and village in Britain has a War Memorial. They take many forms, the commonest being an obelisk, a cross or statue of a soldier. Some commemorate the inhabitants of a place, some are for schools and others are for companies or Military groupings.
Many memorials are grade II listed, 61 are II* listed, Link*_listed_war_memorials_in_England
& 12 are Grade I listed. Link
A search for memorials can be carried out at Link