You can learn about the history of Lübeck with a visit to Salt Storage Warehouses. While you're in the area, stroll along the riverfront.
Museum Holstentor is just one of the attractions in Lübeck Old Town, Lübeck so you might want to stop by during your trip. If you want to experience more of the culture Lübeck has to offer, head to Lübeck Christmas Market, Lübeck Town Hall, and Gothmund.