Canada:Yukon Territory
This attraction is located at the north end of the town of Watson Lake. Carl K Lindley, a construction engineer of the Alaska Highway set it up first in 1942. Over the years vistors have added many signs, the number now reaching over 37000.
Although I spent a few amount of time looking, I couldn't find a Japanese one. If I have a chance to visit there again, I hope to bring a sign from Japan...... but I wonder how to get one from the street.