The historical markers are a permanent sign installed in a public place to commemorate a link between that location and a famous person, event, or former building on the site.
A blue plaque was recently unveiled for Laura Annie Willson, a pioneering engineer and suffragette. Click here to read the story.
Here are ten blue plaques commemorating important people, places or organisations that have been unveiled by Halifax Civic Trust over the years.
5. John Crossley
Founder of John Crossley and Sons, carpet manufacturers, John Crossley's blue plaque is on the site at Dean Clough in Halifax, once the largest integrated carpet factory in the world. Photo: Tony Johnson
6. John Mackintosh
John Mackintosh, founder of confectioners John Mackintosh and Sons, toffee makers and confectioners, now part of Nestle, has a blue plaque at Bailey Hall Mill, part of Nestles Albion Mills in Halifax. Photo: Bruce Fitzgerald
7. Percy Shaw
Percy Shaw's blue plaque is located at Boothtown House, his home where the inventor of the catseye founded the Reflecting Roadstuds company ahead of manufacturing them in the 20th century. Photo: Jpress
8. Jocelyn Horner
Sculptor Jocelyn Horner has a plaque at Green Hayes, the house at Savile Park Road, Bell Hall, Halifax, where she was born, lived, worked and died, now the home of Lawrence Funeral Services. Photo: Bruce Fitzgerald