The Silver Jubilee Walk in London. I think it’s now just called the Jubilee Walk.
We walked this soon after it opened in 1977, taking a day to do the full walk following the silver markers set in the pavements.
I was 20 then and my DH 24, we were laughing about it the other day as I doubt now we could do 2 miles let alone 15, me with my arthritic knees and hip, and him with his dodgy back!
We did walk part of it again about 15 years ago before we moved away from the SouthEast.
The areas it goes through have changed a lot over the years, there was no new Globe Theatre,no London Eye for example, I think I preferred it when we first walked it, less touristy and built up.