I found a new site www.platial.com which seems quite popular. It's using Google Earth and people are marking places which mean something to them. Apart from the obvious, where I have lived, and where someone broke my heart, there is also where I heard this music, (including Philip Glass in Josemite Park). The map of polonium-210 in London is already done here. Not sure I could be bothered myself, but not uninteresting over all.