Even if you're not a student, a visit to the Warsaw University Library & Gardens (BUW) is not to be passed up. If the building's architecture, books and gardens don't appease you, then the Polish Poster Gallery will raise an eyebrow of interest. The gallery showcases the best original works of vintage and contemporary poster art by international and Polish artists of the Polish Poster School (it's amazing that's even a thing!), whose works you can view in person, and even purchase on the spot or online. This is definitely worth a visit!