The thread that shed light on the enigmatic Frank Sacherer is my pick for the best ever on ST. It combines physics, rock climbing, ice climbing, triumph, tragedy, love, loss, Yosemite, Chamonix, heart felt personal observations, and a story-book ending. A collective work with authors from all over the globe made possible by the internet, it is a staggering work of heartbreaking genius of a thread.
One good tool for supertopo time travel is add numbers to the URL. ie: click on "prior 30 topics" then in the URL you see the number 30 - as you add more numerals to that number and refresh the page, the farther back in history you go.