This is a so called Customs-Station from our Leniland Story Server. (Minecraft Java 1.17)
Paste it where you stand. It faces south.
It is one of many pieces of the Leniland Story Server, making it possible to create your own adventure map.
Find more videos of the Leniland Minecraft Story Server at YouTube: https://www.youtube.com/c/LenilandStories/videos