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Waterloo is the busiest station in Britain (passenger numbers) and the largest of the London terminal stations.
Opened by the London and South Western Railway (L&SWR) on 11 July 1848 as 'Waterloo Bridge Station',it was designed by William Tite. In 1886 it officially became 'Waterloo Station'.
In 1899 the L&SWR decided on a total rebuilding. The new station was opened in stages, finally opened in 1922 with 21 platforms and a concourse nearly 800 feet (250 m) long. The main pedestrian entrance, the Victory Arch (known as Exit 5), is a memorial to company staff who were killed during the two world wars.
Platforms 20 and 21 were lost to the Waterloo International railway station site, which from November 1994 to November 2007 was the London terminus of Eurostar international trains to Paris and Brussels.
A few minutes walk from the main station, connected by a walkway, is Waterloo East, which connects with trains from Charing Cross

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