Amsterdam is built on 90 islands. It is a maze of canals……more canals than Venice, and has 1,281 bridges. 65 of these are drawbridges, necessary to allow higher vessels to pass through.
Some are old wooden bridges and some are new. There was a particularly interesting modern bridge near where we were staying and I happened to be around one day when it opened.
It all happens quite quickly. The bridge opens, the boats pass through, the bridge closes and everyone goes on their way.