Outdoor swimming pools (or lidos) were popular in the United Kingdom between World Wars I and II, and quite a few were constructed around the country. However, one of the most unusual to be built was the lido in Jesus Green (a park named after nearby Jesus College) in Cambridge. Opened in 1923, the Jesus Green Lido runs parallel to the River Cam and was designed to look similar to the river itself. With a length of 100 yards (90 meters), it is tied with the Tooting Bec Lido in London…