Doors are a very ancient type of human construction, and even today they still serve the purpose of theft prevention and privacy protection. However, there are also several mysterious doors in the world that we still cannot open, and we have no idea what is behind them!
2. The Sphinx is the most famous and mysterious human structure in the world. Many people believe that it has a lifespan of over 10,000 years. Archaeologists have discovered through modern X-ray scans that there is a hidden room deep within the Sphinx that may never be opened.
3. The Svalbard Global Seed Vault is located in a mountain range over 1000 kilometers from the North Pole within the Arctic Circle. It preserves the seeds of the vast majority of crops in the world. As a result, it is also one of the most heavily guarded places in the world, and only a few people are allowed to enter!
4. North Brother Island was an isolated island from the 1880s until World War II, where people carrying infectious diseases were sent. It has been abandoned for nearly half a century, and it is still illegal to set foot on the island without permission.
5. The Mausoleum of the First Qin Emperor is the tomb of Emperor Qin Shi Huang, the first emperor in Chinese history, and the first large-scale and well-designed imperial tomb in Chinese history. Due to the need for protection, the Mausoleum of the First Qin Emperor has yet to be excavated, and what is inside remains a mystery to this day!
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