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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.
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

Seven centuries ago, the new town of Winchelsea was founded by Edward I to take the place of an older town of the same name, which had been lost to the sea in a series of great storms. The new town of Winchelsea assumed Old Winchelsea's status of Ancient Town and Head Port of the Cinque Port Confederation, a medieval alliance of Kent and Sussex ports. For over a hundred years, New Winchelsea was one of the major ports of the kingdom.
Today, Winchelsea sits quietly on its hill, gazing across marshland at the now-distant sea. But all around this beautiful village are the remnants of past glory: the Church of St Thomas the Martyr; three medieval gates.
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