You'll want to browse the collections at B-413 Submarine Museum, Museum of the World Ocean, and Bunker Museum. Ruins of Koenigsberg castle, Honey Bridge, and Timber Bridge are monuments to see when you're exploring the area around Park of Sculpture. You can watch performances at Kaliningrad Regional Drama Theatre, Kaliningrad Regional Musical Theatre, and Kaliningrad Regional Philharmonic Hall if you're interested in local theater.