They pay homage to the great and the good of those who have gone before us but left a legacy behind them.
From honoring a Formula One World Champion to a boxer a missionary here’s a round of some of the plaques in Sheffield.
Why not take a walk and see how many you can spot.
Want more Sheffield retro? People and events you’ll only remember if you live in Burngreave, Sheffield from the air in the 1990s
5. Charlie Williams
Janice Brown widow comedian Charlie williams with the Blue plaque | Yorkshire Post Newspapers Photo: Chris Lawton
6. Mike Hawthornes
Mike Hawthornes plaque at Mexborough remembering him as the first British Formula One World Champion | JPIMedia Photo: Dean Atkins
7. Remembrance plaque
Walt Penny, British Waterways supervisor took alook at the newly unveiled plaque at Tisley Marina | JPIMedia Photo: Dean Atkins
8. Alf Liversidge
Pictured at the unveiling of a memorial plaque to Swinton 'Forgotten sporting hero' Alf Liversidge at the Station Hotel, Swinton, are his two Great Grandaughters Alice Scholey (left) and Emily Gittings along with present day Boxing hero John Jo Irwin. | JPIMedia Photo: Steve Ellis