I thought your idea was really cool so I gave it a go.
I live about 20 minutes from a minor US city.
All but 1 prompts were in a 3-block radius IN the city (again, about 20 minutes from my town's town hall).
So the 1 prompt I didn't know I guessed the same 3 block radius as the others, and it was about 2 miles away. Still in the city, not the town I typed in.
It seems like smaller towns will be gobbled up by famous cities elements. Especially here in New England where the majority of 'famous' local things are so few.
edit: also, changing the 'radius' resets the city to where the website THINKS I am instead of where I typed in.
All but 1 prompts were in a 3-block radius IN the city (again, about 20 minutes from my town's town hall).
So the 1 prompt I didn't know I guessed the same 3 block radius as the others, and it was about 2 miles away. Still in the city, not the town I typed in.
It seems like smaller towns will be gobbled up by famous cities elements. Especially here in New England where the majority of 'famous' local things are so few.
edit: also, changing the 'radius' resets the city to where the website THINKS I am instead of where I typed in.