Enlightened aristocrats trying to rouse Prague from provincial stupor founded the Šternberg Gallery in the 1790s. Located just outside the gates of Prague Castle, the palace now houses the National Gallery's European old masters. It's not a large collection, especially since some of its most famous works were returned to their pre-war owners, but some outstanding paintings remain, including a brilliant Frans Hals portrait and Dürer's Feast of the Rosary. The gallery's recent renovations made space for more paintings from the repositories, and restored ceiling frescoes and mouldings that had long been covered up. It's now fully dusted off and well worth an hour.