We are looking for a metaphorical "Litfaßsäule". From Germany, you would know the real ones, up to the second floor, cylindrical, conical top. Early on Monday, workers come to take down the old posters, and to glue on new ones, with ladders and large buckets. At election time you see the same faces on them, all over and over. Like the "Normaluhr", they serve as landmarks for lovers to meet. No such thing in the US, therefore my suggestion.