Sign Post Forest is a collection of signs at Watson Lake, Yukon, Canada, and is one of the most famous of the landmarks along the Alaska Highway. It was started by a homesick GI in 1942. He was assigned light duty while recovering from an injury and erected the signpost for his hometown: Danville, Ill. 2835 miles. Visitors may add their own signs to the more than 100,000 already present.