Touristiness heatmap by number of public photos
maps.google.com
maps.google.com
But it is extremely touristy. Highway 101 grinds to a stand still most summer days, especially when it's really hot inland in Portland / Salem / Eugene.
Wouldn't have expected the USA to be that much less touristy than Europe, though. And within Europe, western France seems to attract fewer photographs than even rurual Turkey.
ETA. Based on http://www.panoramio.com/ -- I think a little bit of the skew in the Alps may have to do with panoramas counting for larger area (you can cover a lot more area from peaks in the Alps than say...at lower altitudes). The rest seems very legit. Very nice...
Plenty of very highly visited areas are not that memorable by themselves other than that they receive a large amount of sunshine and this alone will attract large numbers of tourists from the North West of Europe.
And not in the Southern hemisphere either.
I swear I picked the name before I saw your post :P
The have high resolution (100m x 100m) resolution photo heat maps of the UK. (Note the amount of green in Scotland, meaning no pics at all of that grid square).
That said, I love the concept and the clever use of public data to make a guess about something else.
I'd go with the Alps
One could argue that North Korea is safer than (say) Thailand now, but I still wonder why go there if you aren't a researcher or spy.