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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

Brenchley is an attractive village east of Tunbridge Wells. It has a number of Tudor and Elizabethan buildings and many listed buildings. The village has a church, school, post office and butchers.
Website: Link

Wealden Hall Houses were timber framed farmhouses built by wealthy Yeoman farmers from the late 1300's to the mid 1500's (late Mediaeval to Tudor times). Originating in the South East, in the Weald of Kent and Sussex, they spread to other Southern counties around England. They remain most prevalent in the South East, particularly in areas surrounding Maidstone. The buildings can be identified by their distinct front jettied first floor end bays. …read more here Link