Sentrum is Oslo’s compact, bustling downtown, packed with historic buildings like the 13th-century Akershus Fortress. Cultural landmarks include the contemporary Oslo Opera House and the National Museum, whose Edvard Munch collection includes “The Scream.” Main street Karl Johans Gate is lined with casual eateries, pubs and designer clothing stores, while the trendy Aker Brygge area offers upscale waterside dining.