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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 Savoy Hotel is a luxury hotel located on the Strand. Built by impresario Richard D'Oyly Carte with profits from his Gilbert and Sullivan operas, it opened on 6 August 1889. It was the first in the Savoy group of hotels and restaurants owned by Carte's family for over a century. The Savoy was the first luxury hotel in Britain, introducing electric lights throughout the building, electric lifts, bathrooms in most of the lavishly furnished rooms, constant hot and cold running water, and many other innovations.
The hotel is now managed by Fairmont Hotels and Resorts. It has been called "London's most famous hotel" and remains one of London's most prestigious and opulent hotels, with 268 rooms and panoramic views of the River Thames across Savoy Place and the Thames Embankment. It is a Grade II Listed Building. Link