Kaikyo Yume Tower
It’s 70 seconds to the top from the see-through elevator.
The observation room is at 143m, one of the highest in Japan. From there, you can see a superb 360 view of the Kanmon Straits, Ganryujima Island, Hibikinada, and Kyushu on the opposite shore.
The light displays at night change depending on the season/day of the week, and they are a must-see.
It is a designated "Lover’s Sanctuary."