Tachū Naitō was the builder of which observation tower in the Shiba-koen district of Minato, Tokyo?
Tachū Naitō:  He was a father of earthquake-proof design and built many broadcasting and observation towers, including the Tokyo Tower. Tokyo Tower: Tokyo Tower (東京タワー , Tōkyō tawā ) is a communications and observation tower in the Shiba-koen district of Minato, Tokyo, Japan.
Tokyo Tower