I have also came across (predictably perhaps) countless sightseeing tourists recording their experiences. Some of the more curious, or architectually minded, take photos of buildings. I don’t know their backstories or what brought them to the cities I've encountered them in, but they all share an interest in seeing a city’s culture and history through its buildings.
Here are just a few.

February 2012, London

October 2012, Storrs, CT

June 2012, New Haven, CT
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