You'll want to browse the collections at B-413 Submarine Museum, Kaliningrad Regional Museum of History and Arts, and Bunker Museum. Honey Bridge, Timber Bridge, and Brandenburg Gate are monuments to see when you're exploring the area around Friedrichsburg Gate. You can watch performances at Queen Louise Kirsch Puppet Theater, Kaliningrad Regional Musical Theatre, and Music theatre on Basseynaya if you're interested in local theater.