These maps are really remarkable work:
Heffernan’s map of Dublin, published 1 May 1861, is both highly unusual and very fine. No other map of the time gives such a bird’s eye, almost axonometric, view of the city’s edifices. It shows in exceptional elevational detail both a number of the city’s principal public buildings, but also its less vaunted institutions; prisons, hospitals, workhouses etc., all within the municipal boundary set by the two canals.
A lovely appraisal of classic 1970s SF set design