The Yalding Sign is a mysterious ancient monument situated in the North Downs of Surrey, England. This enigmatic sign is a series of intricate carvings and symbols etched into a 15-meter-long (50-foot-long) trench in the earth. The carvings depict various geometric patterns, animals, and human figures, although their meanings remain unknown. The sign is estimated to date back to the Iron Age or Roman era, around 2,000 years ago. Despite its age, the Yalding Sign remains remarkably well-preserved, with many of its carvings still clearly visible today.