With crystal lined walls glittering deep beneath the earth's surface, these mesmerising scenes are taken from inside what could well be the world's most beautiful cave. The Mlynki is a rare crystal cave which lies in the Ternopil region of Ukraine and is known for the multi-coloured gypsum crystals which adorn its walls and twinkle in the light. These are the awesome images taken by intrepid photographer Oleg Grigorev who ventured into the remote cave to capture its beauty on camera.
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