The All-Japan Tower Association designated October 1 as "Observation Day" in 2006. The date was established from the Japanese word “tenbou”, which means "observation" in English. The beginning sound of “tenbou” is ten, representing the tenth month, and “bou” sounds like “stick” in English, which resembles the number “1”.

Each tower organizes many special events for your enjoyment. We encourage you to explore our website and visit your favorite tower. Why don't you visit two or more towers on Observation Day?