There are so many, I recommend you a book I have read: "The Complete Collection of Unsolved Mysteries of the World"
The author is Zhao Yanfei, that edition There are many things in this book that today's science cannot fully explain.
Let me talk about two examples that I still remember, have a deep impression on, and are familiar to everyone.
For example, the Terracotta Warriors and Horses of Qin Shihuang were excavated in Xi'an, Shaanxi Province, my country.
You may find it strange that the Terracotta Warriors and Horses are just statues of soldiers made of clay. At best, they can only be regarded as a "miraculous" huge project. Their origins and ownership are clear, so how can they be regarded as unsolved? What about the mystery?
However, what is "mysterious" is not the origin of these terracotta warriors and horses, but their preservation technology.
When archaeologists excavated the Mausoleum of Qin Shihuang and discovered the Terracotta Warriors and Horses, the various bronze utensils inside were still as clean as new and extremely sharp.
After the determination of relevant experts, it was discovered that these utensils were actually processed and preserved using a modern oxidation treatment method.
You must know that this processing method was only discovered and patented in the United States in the 20th century. Why did the Qin Dynasty in the East, even in the Bronze Age, have this method two thousand years ago? What kind of chemical technology?
The same goes for the Loch Ness Monster in the UK.
Scientifically speaking, Loch Ness has been searched and explored by many researchers.
Often no trace of the Loch Ness Monster is found, but at the same time, there are also many times when some clues are suddenly revealed.
It is undeniable that according to the photos taken by witnesses who discovered the Loch Ness Monster at the time, as well as the British official aerial photography of Loch Ness, there is indeed a long-necked creature in Loch Ness.
These evidences appeared more than once or twice, but every time after this "unknown creature" was discovered, it disappeared again when everyone looked for it again.
In addition to these two confusing phenomena, there are many other events for which we still cannot give a scientific explanation.
So, we still cannot fully understand the wonders of the earth, so we should maintain respect and awe for nature in our lives.