The Norwegian Museum of Cultural History is located at Bygdøy in Oslo and has an open-air museum with 160 historic buildings.  One of the main attractions is Gol Stave Church which dates from around 1200.  Indoor exhibits include Norwegian folk costumes, folk art, church art and Sami culture.  There are temporary exhibits and activities for children all year.
Opening times:
In the winter half year, from September 15th – May 14th, the museum is open on weekdays 11:00 – 15:00 and at weekends from 11:00 – 16:00
In summer from May 15th – September the museum is open every day from 10:00 – 18:00
Open between Christmas and New Year from 11:00 – 15:00.
Closed Christmas Eve, Christmas Day, New Year’s Eve and New Year’s Day.

By bus, take the 250 bus from Vollen to Nationaltheatret and then the number 30 bus towards Bygdøy, getting off at Folkemuseet.  The journey should take one hour.

There is a large gift shop at the Folk Museum.  Do be aware that the prices are very high, even for Norway.