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 Youth Theater for Young Spectators, Art House Concert and Theater Complex, and Kaliningrad Regional Drama Theatre if you're interested in local theater.