Barnaby's Tower stands at the southeast corner of the city walls

Chester city walls

.Chester city walls consist of a defensive structure built to protect the city of Chester in Cheshire, England. Their construction was started by the Romans when they established the fortress of Deva Victrix between 70 and 80 AD. It originated with a rampart of earth and turf surmounted by a...

 of Chester

Chester

Chester is a city in Cheshire, England. Lying on the River Dee, close to the border with Wales, it is home to 77,040 inhabitants, and is the largest and most populous settlement of the wider unitary authority area of Cheshire West and Chester, which had a population of 328,100 according to the...

, Cheshire

Cheshire

Cheshire is a ceremonial county in North West England. Cheshire's county town is the city of Chester, although its largest town is Warrington. Other major towns include Widnes, Congleton, Crewe, Ellesmere Port, Runcorn, Macclesfield, Winsford, Northwich, and Wilmslow...

, England. It has been designated by English Heritage

English Heritage

English Heritage . is an executive non-departmental public body of the British Government sponsored by the Department for Culture, Media and Sport...

 as a Grade I listed building.

The tower probably dates from the 13th century, and it was damaged in 1664–66 during the Civil War

English Civil War

The English Civil War was a series of armed conflicts and political machinations between Parliamentarians and Royalists...

. When the city walls were converted into a raised walkway between 1702 and 1708, the tower was converted to form a feature at this corner. It has been repaired on occasions since, and in 1879–80 was altered at the expense of one of the city councillors.

The tower is constructed in coursed

Course (architecture)

A course is a continuous horizontal layer of similarly-sized building material one unit high, usually in a wall. The term is almost always used in conjunction with unit masonry such as brick, cut stone, or concrete masonry units .-Styles:...

 red sandstone

Sandstone

Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...

 rubble

Rubble

Rubble is broken stone, of irregular size, shape and texture. This word is closely connected in derivation with "rubbish", which was formerly also applied to what we now call "rubble". Rubble naturally found in the soil is known also as brash...

, and stands on a stony outcrop

Outcrop

An outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. -Features:Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial deposits are covered by a mantle of soil and vegetation and cannot be...

. It forms a three-sided projection from the walls, its top being level with the walkway, and is decorated with mock crenellation

Battlement

A battlement in defensive architecture, such as that of city walls or castles, comprises a parapet , in which portions have been cut out at intervals to allow the discharge of arrows or other missiles. These cut-out portions form crenels...

. There is no evidence of any chamber at a lower level.