The Plantin-Moretus House was more interesting than I thought it would be. What made is so interesting is that a single family lived in the same house for several centuries, running a printing business in the same facility. Because of the continuity, they preserved some of the oldest printing presses and printing material in the world.
The house also contains several original paintings by Rubens, which you would otherwise have to go to an art museum to see.
The site is located in the heart of Antwerp and is easy walking distance from the Cathedral and other attractions.