https://www.lonelyplanet.com/points-of-interest/beppu-tower/1396875
Beppu Tower | Beppu, Japan | Attractions - Lonely Planet
Built in 1957, this erector-set-style tower near the bay has an observation deck with 360-degree views. It's a popular visit for couples.
beppu towerjapan attractionslonelyplanet
https://www.kkday.com/en-nz/product/140030
Oita Beppu Tower Sea, Mountain and Hot Spring Town Observatory Admission Ticket - KKday
This is the ticket purchase page for Beppu Tower in Beppu City, Oita Prefecture.