Sanna, also known as the "island with the mountains". Sanna has high mountain peaks, beautiful hiking trails, white beaches and dark caves, and is highly recommended for all visitors! Kirkhelleren is the most impressive cave on Sanna, Træna. The cave measures 45 metres deep, 20 metres wide and up to 32 metres tall.
Inside the cave are natural stone formations referred to as the Altar, the Pulpit and the Pulpit Steps – which explains why Kirkhelleren is called Mother Nature’s Cathedral.
On Sanna are traces of some of Norway’s oldest settlements; archaeological finds include tools and bone fragments. Much later the cave was used as a burial site.
Most of the 33 remains found are from a 14th-century mass grave. Due to its impressive acoustics, Kirkhelleren is a key venue for concerts during the Træna Festival.