These photos show Sheffield as you rarely get to see it - from above.
They take you back through decades of change in the city centre, from the early 1930s to the mid-90s.
Pictured are many of the landmarks which have come and gone during that period, including the Regent Cinema at Barker's Pool, Grosvenor House Hotel and the notorious Egg Box town hall extension.
Standing proud amid all the new developments are historic buildings like Sheffield Town Hall, Sheffield Cathedral and Sheffield Midland Station.
This retro photo gallery reveals how the city has evolved over time, showing one of the old gasometers which were once a common sight around the country and the former Central Fire Station which is today a popular bar.
It also captures changes to the Peace Gardens and famous streets like Fargate and The Moor.
9. St Mary's Church
Sheffield city centre pictured some time between 1960 and 1979, with St Mary's Church, on Bramall Lane, in the foreground | Picture Sheffield Photo: Picture Sheffield
10. Bus depot
Sheffield city centre some time between 1960 and 1979, with Tenter Street bus depot, centre right next to Townhead Street (crescent-shaped flats). The building in the bottom left corner with the white curved entrance is Rippon Brothers car dealers | Picture Sheffield Photo: Picture Sheffield
11. Pond Street
An aerial view of the Pond Street area of Sheffield city centre in 1968, with Sheffield Polytechnic, as it was then, to the left and the bus station in the centre | Picture Sheffield Photo: Picture Sheffield
12. Bard Street flats
Looking down on the Bard Street flats, Park, Sheffield, in 1969, with Hyde Park flats and the city centre in the background | Picture Sheffield/R. Brightman Photo: Picture Sheffield/R. Brightman