I need to still find some additional samples, but I
think we're up to about 30 jars of places - like, Valley of the Kings in Luxor, Yosemite National Park, Chateau LaFite Rothschild's vineyards in Bordeaux - you get the idea.
The only rule (which I broke only once) was that they had to be a place that we went to together. Turns out I have some grass from Stonehenge that I went to without Pooky.