free-swinging medieval bell, 自由擺動的中世紀的鐘

Pre-school children look at the Gloriosa, the trinity bell from 1721 and the world's largest free-swinging medieval bell, in the Erfurt Cathedral, in Erfurt, Germany.
April 7, 2016
http://www.voanews.com/media/photogallery/april-7-2016-day-in-photos/3274991.html