Trümmelbach falls in Switzerland are Europe’s largest subterranean waterfalls. It's not one, but 10 glacier-waterfalls. They are made accessible via a network of walkways, tunnels, galleries, and overlooks leading into and through the mountain. These are the only waterfalls in the world that can be viewed this way.
More information on how to visit Trümmelbach falls and what to expect: [ Ссылка ]

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