#charlesbridge
Construction Animation of the Charles Bridge (Karlův most) showing medieval engineering techniques
The bridge spans across the Vltava (Moldau) river in Prague, Czech Republic. This video is the longer-form (3m), higher-quality version of a gif circulating earlier on Twitter and elsewhere.
https://www.youtube.com/watch?v=nJgD6gyi0Wk
Background on the bridge:
https://en.wikipedia.org/wiki/Charles_Bridge
Article (in Czech): http://praha-archeologicka.cz/p/212
HN discussion: https://news.ycombinator.com/item?id=24798302
Most is related to English mast, and gives us Mostar (named after Stari Most in Bosnia and Herzegovina), as well as, probably, Mosul, Iraq, for its Tigris river bridge..