We're asking you to turn detective and help identify these mystery photos taken down the years at sites across Sheffield.
They are all taken from the Picture Sheffield archives, which are a treasure trove of information about the city's past.
But the locations are unidentified, which is why we want your help to reveal additional information about the scenes pictured.
In some cases there are more clues than others. Sometimes the full date or a rough location is known but with other photos this information is missing.
What we do know is that all the photos were taken some time during the 1970s, 80s or 90s, somewhere in Sheffield.
The unidentified locations include school buildings, factories, streets and flats.
Do you recognise any of the sites pictured and can you tell us any more about them? Do they hold any happy memories for you?
If you can help fill in the gaps, please email [email protected] and we will pass the information on to the team at Picture Sheffield.
1. Bar area
An unidentified bar area somewhere in Sheffield , possibly at a cinema, photographed some time between 1980 and 1999 Photo: Picture Sheffield/SCC PR Unit
2. TV Centre
A TV repair centre on an unknown street, somewhere in Sheffield, photographed some time between 1980 and 1999 Photo: Picture Sheffield/SCC Planning
3. Factory
An unidentified clothing manufacturer, somewhere in Sheffield, between 1980 and 1999 Photo: Picture Sheffield/SCC
4. Street scene
An unidentified street in Sheffield pictured some time between 1980 and 1999 Date Period: 1980-1999 Photo: Picture Sheffield/Douglas Edward Axe/Brian Douglas Stevens