The singing caves — a network of caverns so named because of their unique acoustics — can be considered among Iceland's most unusual tourist attractions. Listen and be amazed!
The Caves That Sing: Amazing Acoustics of Iceland's Depths
17:04 GMT 10.08.2015 (Updated: 17:09 GMT 10.08.2015)
© YouTube/@Sigurboði Grétarsson
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The music of the Earth.