1. Explore The Miniatur Wunderland
This is one of the Hamburg places to visit that does not disappoint. You might love the attention to detail and the smallest features, like the day/night cycles and how they mimic the dusk scenery.
There are many exhibits from different countries, including Germany, Brazil, and the US. It is interactive, and everything comes to life. You will see mini humans, moving trains, and subway trains and stations.
It is also lovely to have an opening viewing where the engineers run the mechanics of the whole thing. You can easily spend more than two hours just looking at everything.