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The Nottingham Canal was 14.7 miles long from Langley Mill to the River Trent in Nottingham. William Jessop was appointed in 1791 to survey the Canal but most of the work was done by James Green. The canal was put before Parliament in 1792 and Benjamin Outram made engineer under Jessop who had to give up the post as Chief Engineer before completion due to illness. The canal opened in 1796 after many difficulties at a cost of £43,500, twice the estimate. From the 1840s after the arrival of the railways the canal declined and was abandoned altogether in 1936 by the then owners Great Northern Railway Co. The section between the Trent and Lenton was passed to Trent Navigation Company at this time. Most of the canal was built over from 1955 but the section from Derby Road to Lenton Chain was re-used as a new course for the River Leen and so is still in water and remains in use as part of the Beeston and Nottingham Canal that allows boats to navigate past the shallow water on the Trent at Clifton Bridge and the weir at Beeston.

National Route 6 of the National Cycle Network passes through Watford, Luton, Milton Keynes, Northampton, Market Harborough, Leicester, Derby, Nottingham, Worksop, Sheffield, Manchester, Blackburn, Preston, Lancaster, Kendal and Windermere, and will connect London and Threlkeld (nr. Keswick) in Cumbria when complete.

Link National Route 6 on the Sustrans web site.

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia Link