I got interested in Bristol's medieval water supplies after poking around near Jacobs Wells Road and Brandon Hill. It was during that research I found out about a pipe that's still there today, and, as far as I know, still actually functioning, that was originally commissioned by Carmelite monks in the 13th century. They wanted a supply of spring water from Brandon Hill to their priory on the site of what's now the Bristol Beacon—Colston Hall, as-was. It was created around 1267, and later, in 1376, extended generously with an extra "feather" pipe to St John's On The Wall, giving the pipework its modern name of "St John's Conduit".
St John's on the Wall is still there, guarding the remaining city gate at the end of Broad Street, and the outlet tap area was recently refurbished. It doesn't run continuously now, like it did when I first moved to Bristol and worked at the end of Broad Street, in the Everard Building, but I believe the pipe still functions. One day I'd like to see that tap running...
There are a few links on the web about the pipe, but by far the best thing to do is to watch this short and fascinating 1970s TV documentary called The Hidden Source, which has some footage of the actual pipe and also lots of fantastic general footage of Bristol in the seventies.
On my walk today I was actually just going to the building society in town, but I decided to trace some of the route of the Carmelite pipe, including visiting streets it runs under, like Park Street, Christmas Street, and, of course, Pipe Lane. I also went a bit out of my way to check out St James' Priory, the oldest building in Bristol, seeing as it was just around the corner from the building society.
There are far too many pictures from this walk, and my feet are now quite sore, because it was a long one. But I enjoyed it.