The Devil's Cave, also known Pirunkirkko, is situated in the Koli mountain range in eastern Finland. It has been used for centuries as a gathering place for local sages to contact the spirit world ...

The national park of Koli in eastern Finland is home to a famous, 34-metre-long crevice cave known as Pirunkirkko, or Devil's Church in English. A new study investigates the acoustics of the Devil ...