In the rock of Dore Holm is a natural archway, 70 ft.
The road rose so steeply here that in 1812 an effort was made to lessen the slope for coaches by means of an archway, and a new way was completed in 1900.
Over the western archway was a white cage for the muazzin, and outside it was a gigantic minaret 120 ft.
In 1715 William Mackintosh of Borlum (1662-1743) and his force of Jacobite Highlanders captured the Citadel, of which only the name of Citadel Street and the archway in Couper Street have preserved the memory.
An archway leading down to the shore bears an inscription showing that it was erected by George Culmer in 1540, and not far off is the site of a chapel of the Virgin, to which ships were accustomed to lower their top-sails as they passed.