The link was to a Google Apps Form I created. Students simply entered the answer after completing the search. I asked them to screenshot the information so that they could not simply get the answer from a neighbor. I also used the screenshots later to discuss effective keywords.
I created a Google presentation of photographs which had captions. These provided the search terms. We reviewed using only the most important terms, leaving out words such as "in the." I have been amazed at how difficult it has been for my students to pare down their search terms. They often type in a complete question, which I strongly discourage.
There was a lot of "buzz" about the photos, which was fun. I heard students guessing locations with each other as they searched.
I was able to check and give feedback immediately after they submitted their answers. As I spot checked their screenshots, I was able to help them modify their search terms if needed. Most students were very successful, correctly identifying most of the 12 locations.
I want to take this idea to the next level, in which students create the photo clues for each other.