I'm living in Dresden - the most beautiful city. Dresden owns one of the most famous and biggest galeries in the world. The "Galerie Alte Meister" (Gallery of the Old Masters) is under reconstruction in the moment. You can only see parts of the pintings but the most famous. Happy enough they digitized many of the paintngs already. You can look at them independently from times, places or an ongoing reconstruction.
Tourists are for sure most interested in the most famous paintings as "Die Sixtinische Madonna" (The Sixtina). But you can find much more. One of my favorite paintings is "Der Turmbau zu Babel" (Building the Tower of Babel) by Maarten van Valkenborch. You can look on the website of the Gallery here to get a taste. It Is also an interesting allegory for many questions in Business Architecture or Enterprise Architecture. Which elements do we need? What are the relationships? How do we work together?