Stack Rock Fort

Stack Rock Fort to Angle Penninsula - Thorn Island
Perhaps the most striking of all the Haven forts / sitting remote on a mid-channel rock in the haven / originally a Cambridge Gun Tower / 1851 / similar to the Martello Towers of Pembroke Dock .
Between 1859 and 1870 the present building was built / a circular casemated fort with 23 guns / which completely enveloped the former tower / accommodation for 180 men .