Sign Post Forest is a quirky collection of signs located in Watson Lake, Yukon, Canada, along the Alaska Highway. It all started back in 1942 when a homesick GI decided to add a sign pointing towards his hometown, Danville, Illinois. Since then, visitors have been adding their own signs to the mix, resulting in over 100,000 unique markers scattered throughout the forest. It's like a giant scrapbook of travel memories that keeps on growing with each new addition.