Oslo's story runs from Harald Hardrada's 1049 trading post through Danish rule, the Akershus stronghold and five years of Nazi occupation. Three days trace it through royal ships, casemates, Resistance cells and surviving timber quarters.
King Haakon V began this stronghold around 1299; it survived nine sieges and never fell to a foreign enemy. The Renaissance castle holds the Royal Mausoleum, banquet halls and dungeons. Castle entry 100 NOK, grounds free daily 06:00–21:00.
Oslo's oldest standing building, a Romanesque stone basilica raised around 1080–1100 above silver mines that partly funded it. Thick walls, restored 1860s interior and a hillside graveyard. Free entry, open limited hours mid-week and Sundays.
The Oseberg, Gokstad and Tune ships were buried between 834 and 900 AD and excavated from Vestfold mounds. The Bygdøy museum is closed for its 2027 rebuild; the peninsula's burial-mound landscape and Kongsgården estate remain walkable.
The medieval town founded around 1049 lay here until the 1624 fire. Excavated foundations of St Mary's Church, the royal manor and St Clement's sit beside a reconstructed water mirror marking the original shoreline. Open access.
Housed in a 17th-century building inside Akershus, it covers the 9 April 1940 invasion, Quisling's regime, illegal newspapers and the Vemork heavy-water sabotage. Original radios, forged papers and prison cells. Adults 100 NOK, closed Mondays.
Norway's parliament opened in 1866, a yellow-brick and granite rotunda by Emil Langlet. The square in front is named for the 1814 constitutional assembly at Eidsvoll. Free guided tours on Saturdays; passport ID required for entry.
Built 1824–1849 for Carl Johan, the Bernadotte king of Sweden-Norway, and the seat from which independence was negotiated in 1905. Summer guided tours late June to mid-August, 195 NOK; guard change at 13:30 daily.
The government quarter bombed on 22 July 2011, before the Utøya shootings killed 69 more. The temporary memorial and damaged Høyblokka tower stand as the site is redeveloped; a permanent national memorial is under construction.
160 relocated buildings from across Norway, including the stave church from Gol built around 1200 and a reconstructed Oslo apartment block spanning 1865–2002. Adults 220 NOK; costumed interpreters in summer.
After Old Oslo burned in 1624, Christian IV rebuilt the city here in a rigid grid behind the fortress and renamed it Christiania. Rådhusgata and Tollbugata keep 17th-century merchant houses, including the 1626 Garrison Hospital.
The river powered Norway's first factories from the 1840s; Sagene and Grünerløkka filled with worker housing. The Labour Museum at Sagveien 28 shows tenement life. Entry 80 NOK; the riverside path runs 8 km to Maridalsvannet.
Two surviving districts of 1800s timber houses that escaped the fire regulations banning wood in central Christiania. Crooked lanes, painted facades and steep cobbles, still fully residential rather than museum pieces.