Martello

One of a pair of Martello Towers built on either side of the narrow entrance to Lough Foyle in the northwest of Ireland. These towers were build around the coast of the British Isles to protect against an invasion by Napoleon. The entrance to the Lough, while narrow, could not be commanded by a cannon on just one side, hence the need for a pair of towers. This tower is on the County Derry side and is viewed from the County Donegal side of the entrance.