Liverpool Council first commissioned Ray Hely, a senior civil engineer, to photograph council's 1971 celebrations, which included the Festival of Progress.
Little did they know it would grow into an extensive archive of thousands of photographs and kilometres of film, capturing the evolution of Liverpool and its community from 1971 to 1993.
Now residents can step back in time and relive the past at the free Liverpool Regional Museum exhibition titled: Ray Hely: An Engineer's Eye 1971-1993.
Some of his work includes a photo of Olympic gold medal winner Michael Wenden jumping off the blocks at Liverpool Memorial Olympic Pool. There are also shots of parades, bridges and other random gems from the area.
"This wonderful exhibition features images of many Liverpool landmarks, pictured in ways we might never have seen or barely remember," Liverpool Mayor Wendy Waller said.
"Some are still with us today, although they may have changed, while others have given way to new developments.
"The exhibition is not just about buildings and bridges, it's also a record of our everyday lives, with pictures of people out and about at community events, shopping, swimming or just going about their business.
"Very little escaped Ray Hely's lens - this is the official, the unofficial and unseen Liverpool, spanning over two decades from the 1970s into the 1990s."
- Ray Hely: An Engineer's Eye 1971-1993 runs from August 4 to December 23 at Liverpool Regional Museum.