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Gunpowder Magazine

A Grade II Listed Building in Holyhead (Caergybi), Isle of Anglesey

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Latitude: 53.3179 / 53°19'4"N

Longitude: -4.6601 / 4°39'36"W

OS Eastings: 222906

OS Northings: 383405

OS Grid: SH229834

Mapcode National: GBR GMWX.S65

Mapcode Global: WH314.DV5T

Plus Code: 9C5Q889Q+5X

Entry Name: Gunpowder Magazine

Listing Date: 25 July 1994

Last Amended: 25 July 1994

Grade: II

Source: Cadw

Source ID: 14755

Building Class: Industrial

Location: To N of road to Breakwater Country Park, approximately 200m W of bridge over road.

County: Isle of Anglesey

Community: Holyhead (Caergybi)

Community: Holyhead

Locality: Breakwater Quarry

Traditional County: Anglesey

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Mid C19 gunpowder magazine built to store explosives for Breakwater quarries.


Grey stone, Front (S) has porch with monopitch roof, doorway with steel door, and small window to R. Ends each have three buttresses, small window in L wall; plain rear. Interior has two chambers separated by thick walls; brick vaults.

Reasons for Listing

Included of scarce example of building type, illustrating engineering history of quarry and Great Breakwater.

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