Akashi Kaikyō Bridge, between Honshu and Shikoku in Japan, currently the world's longest suspension bridge, uses pendulums within its suspension towers as tuned mass dampers. Ribbon Chapel [10] in Hiroshima, Japan uses a TMD to damp vibrations in two intertwined helical stairways.[11] Tokyo Skytree Yokohama Landmark Tower[12] Chiba Port Tower, Japan