Geograph - photograph every grid square

Grade I listed building, built by Sir Christopher Wren. Link
St. Nicholas Cole Abbey is a church in the City of London located on what is now Queen Victoria Street. Recorded from the twelfth century, the church was destroyed in the Great Fire of London in 1666 and rebuilt by the office of Sir Christopher Wren. The church suffered substantial bomb damage from German bombs during the London Blitz in the Second World War and was reconstructed by Arthur Bailey in 1961-2.
Wikipedia: Link

A few years ago I read a book by Mark Mason "Walking the lines" in which he walked the route of the London Underground lines, overground. I will repeat this visiting all 272 stations (some more than once). My route tries to follow the line of the railway as closely as possible, using footpaths and roads, deviations are made to make the walk more "interesting".

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link