There's one north of Boston [1] that I accidentally found walking one time. Turns out I remembered it from a HN posting some years ago. I'd already walked some

There's one north of Boston [1] that I accidentally found walking one time. Turns out I remembered it from a HN posting some years ago. I'd already walked some 3 mi or so by the time I walked across Neptune, so couldn't go all the way to Topsfield and back. I thought it gave a really good sense of how big space is. It's about 1 mi from Neptune to Uranus and another mile or so to Saturn (as far as I got). On my return I walked directly at a fast walking pace, so it took some 20 minutes to from Saturn to Uranus and another 20 minutes to Neptune. (Distances and times are approximate.) At the time I think I calculated my walking speed to be four times the speed of light. It's pretty awesome, in the original sense, that going 4x light speed it still takes a long time to get from one outer planet to the next. Wikipedia has quite a list of other models [2], although it doesn't seem to include Topsfield, MA. [1] https://www.wickedlocal.com/story/chronicle-transcript/2021/11/19/topsfield-scout-installs-scale-model-of-solar-system-along-rail-trail/8687103002/ https://www.wickedlocal.com/story/chronicle-transcript/2021/... [2] https://en.wikipedia.org/wiki/Solar_System_model https://en.wikipedia.org/wiki/Solar_System_model