Hamburg is a city of water, trade, and culture, and this list keeps a short visit focused on what defines it. Start in the Altstadt around Rathausmarkt, where the town hall anchors the historic core, then walk into Speicherstadt, the vast red-brick warehouse district that shows how the port built the city. The Elbphilharmonie crowns that maritime heritage with striking modern architecture, while a Port Tour boat cruise gets you onto the water that made Hamburg rich in the first place. Add Miniatur Wunderland for a playful counterpoint, and the HVV transit system ties it all together, making this compact selection easy to cover in a day or two.