见所未见 see what one has never seen
Explanation
指看到从来没有看到过的景象或事物。形容事物十分稀罕，前所未有。
Refers to seeing a sight or thing that one has never seen before. Describes something very rare and unprecedented.
Origin Story
话说唐朝时期，一位名叫李白的诗人，游历山水，饱览祖国大好河山。一日，他来到一座深山老林，发现一个巨大的山洞。好奇心驱使下，他走了进去。洞内漆黑一片，伸手不见五指，李白点燃火把，慢慢地走进去。走了许久，眼前豁然开朗，竟然别有洞天。一个巨大的地下宫殿出现在眼前，宫殿金碧辉煌，装饰精美绝伦。墙壁上画着各种奇珍异兽，栩栩如生。殿中央摆放着一张巨大的玉桌，桌上摆放着各种奇珍异宝。李白从来没有见过如此壮观的景象，惊叹不已。他从未想过，在大山深处，竟然隐藏着如此神奇的世界。他写下了一首诗来歌颂这见所未见的奇景，流传至今。
During the Tang Dynasty, a poet named Li Bai traveled through mountains and rivers, admiring the beauty of his motherland. One day, he came to a deep mountain forest and discovered a huge cave. Driven by curiosity, he went inside. The cave was pitch black; Li Bai lit a torch and slowly walked in. After walking for a long time, the path suddenly opened up to a magnificent underground world. A huge palace appeared before him, splendidly decorated with incredibly fine details. The walls were painted with images of strange and wonderful animals, vivid and detailed. In the center of the palace stood a huge jade table, on which various treasures were placed. Li Bai had never seen such a magnificent sight and was overwhelmed with amazement. He never imagined that such a wondrous world was hidden in the depths of the mountains. He wrote a poem to describe this extraordinary scene, which has been passed down to this day.
Usage
用于描写看到前所未有的事物，多与“闻所未闻”连用。
Used to describe seeing something unprecedented, often used with "wen suo wei wen" (hearing something one has never heard before).
Examples
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他见所未见，闻所未闻，大开眼界。
ta jiansuoweijian, wensuoweiwen, da kai yanjie.
He saw and heard things that he had never seen or heard before, which broadened his horizons.
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这次展览中展出的文物，许多都是我们见所未见，闻所未闻的。
zhei ci zhanlan zhong zhanchude wenwu, xueduo dou shi women jiansuoweijian, wensuoweiwen de。
Many of the artifacts on display at the exhibition are unprecedented and unique, things we have never seen or heard of before.