In the Port of Oslo in 1798 you can experience what it may have been like to explore Oslo’s harbour at the end of the 18th century.
On your smartphone you can explore the 360° option. If you're in the Bjørvika area you can compare with today's cityscape. You can also use VR goggles like Google Cardboard.
If you're on a PC or Mac you can also download the experience as a game in full 3D.