Geograph - photograph every grid square

A trip on the London Eye allows tremendous panoramic views of London.

See Link for pictures of the London Eye

The London Eye at a height of 135 metres (443 ft), is the largest Ferris wheel in Europe, and has become the most popular paid tourist attraction in the United Kingdom, visited by over three million people in one year. At the time it was erected, in 1999, it was the tallest Ferris wheel in the world.

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Westminster Bridge was opened in 1750, but fell into disrepair and was replaced by the present bridge in 1862. With an overall length of 252 metres and a 26 metre width, it is a seven-arch wrought iron bridge which has Gothic detailing by Charles Barry (the architect of the Palace of Westminster). It is the oldest bridge in central London. It is Grade II* listed.Link
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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

The River Thames rises at Thames Head in Gloucestershire on the slopes of the Cotswolds and flows generally eastward to its mouth near Southend in Essex. At 215 miles long it is one of the longest rivers in Britain, and the longest entirely within England. It is one of the most important rivers in Britain. Link