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Cley Windmill is a grade II* listed tower mill at Cley next the Sea, which has been converted to a guesthouse offering B&B, wedding receptions and self catering accommodation
Website: Link
Wikipedia: Link

There are three main types of windmill in Great Britain. Post mills, smock mills and tower mills.

The tower mill is generally the largest of the three, built in brick with a pivoting wooden top and sails, turned by a tail fan.

Windmill article Link

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

Cley Marshes is a 176-hectare nature reserve just outside the village of Cley next the Sea, Norfolk. A reserve since 1926, it is the oldest of the reserves belonging to the Norfolk Wildlife Trust (NWT). Cley Marshes protects an area of reed beds, freshwater marsh, pools and wet meadows and has been designated as a Site of Special Scientific Interest (SSSI), Special Area of Conservation (SAC), Special Protection Area (SPA), and Ramsar Site due to the large numbers of birds it attracts.
Wikipedia: Link

Cley next the Sea Anglo-Saxon Clæg "clay", is a village on the River Glaven in Norfolk, 4 miles north-west of Holt and east of Blakeney. The main A149 coast road runs through the centre of the village, causing congestion in the summer months due to the tight, narrow streets. It lies within the Norfolk Coast AONB (Area of Outstanding Natural Beauty) and the North Norfolk Heritage Coast.
Cley was once a very important port, but land reclaimation means that it is no longer "next the sea".
The village has a range of services including a shop, pub and windmill (function room).
Wikipedia: Link

The River Glaven is in Norfolk and is 10 miles long. flows It flows through picturesque North Norfolk countryside to the North Sea at Cley Next the Sea. Rising from a tiny headwater in Bodham the river starts 2½ miles before Selbrigg Pond where three streams combine at the outfall.
Wikipedia: Link