Geograph - photograph every grid square

The Chatham Dockyard's history dates back to 16th century and earlier. For centuries it was at the forefront of shipbuilding, and industrial and architectural technology and for 414 years, it provided over 500 ships to the Royal Navy. At its height the site covered over 400 acres.

The dockyard closed in 1984, and the now a 84 acre section of the site is a visitor attraction managed by the Chatham Historic Dockyard
Trust.

Wikipedia 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.
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.

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 using A, B and C designations.

…read more at wikipedia Link