[dfc]

Why did you say "there are some American cities...and San Francisco is listed at number 3" and not mention:

  1st most photographed city: New York
  Landmark: Empire State Building.

Updated:

Found the source[1], the golden gate bridge did not make their list of top 7 in san francisco. Which could be due to the methodology but it is important to note that there is a problem of selection bias in the article, which may artificially inflate SF's prominence. Its worth pointing out that for NYC landmarks the apple store was ranked higher than liberty island (AKA statue of liberty). Francophiles can rest easy, the Eifel Tower crushed the competition.

[1] https://www.cs.cornell.edu/~dph/papers/photomap-www09.pdf