I had an interesting day helping to show some Japanese visitors round my site, and a second site nearby. Apparently they've only had allotments there since about 1920, and they're still developing. A city plot is about 25 square metres, but in the mountains they have larger plots with huts on them. Unfortunately I forgot the camera (I'm always doing this) so I don't have any pics.
The second site we visited is quite secluded, like mine, but has a completely different atmosphere as there are no hedges. Plots are 2-300 square metres, rather than our 300 or 600. It's more of a standard size, and obviously a lot easier to manage. They've got wide grass verges and communal spaces, with lots of trees. I assumed at first that this originated as plots which were abandoned when allotments were unfashionable, but as far as I could gather, it was actually laid out like that from the beginning. There's a nice communal building with kitchen facilities and toilets; we could do with something similar on my site!