At 1,434 metres above sea level, the road across Sognefjellet is the highest mountain pass in Northern Europe. The road runs along the edge of Jotunheimen National Park.

The road is open from May to October/November.
Inside the national park, you will find Galdhopiggen and Glittertind, which are the highest mountains in Norway. From the mountain plateaux, the road dives west steeply down towards Sognefjorden, the world’s longest and deepest fjord.
From Rv. 55, you can take short or longer
walks, go skiing, join guided cave tours and glacier
crossings or climb in mighty mountains.
The mountain plateaux between Krossbu and Turtagro offer many spectacular viewpoints and rest areas.
From Nes you can see Feigumfossen, a 218-metre waterfall.

Source. Information board on site