You'll want to browse the collections at Bunker Museum, Kaliningrad Regional Museum of History and Arts, and B-413 Submarine Museum. Explore notable local landmarks like Ruins of Koenigsberg castle, Timber Bridge, and Amber Museum. You can watch performances at Kaliningrad Regional Philharmonic Hall, Art House Concert and Theater Complex, and Kaliningrad Regional Youth Theater for Young Spectators if you're interested in local theater.