I got a kick out of seeing this video. It’s a timelapse video taken of a cruise ship going through the Panama Canal. The fun bits with locks are at the beginning and end; in the middle there’s quite a large lake that needs to be sailed across.
My old boat (the USS Hartford, SSN 768) sailed across the Panama Canal a year or two after I left; I’m still a bit jealous that I missed it. Going through the Suez wasn’t nearly as interesting, and I did that twice.