Speaking of Russia, which also borders China, it is the largest country in the world, with a vast territory and a large number of virgin forests. However, due to its special geographical location, it is in a relatively cold area all the year round.
Due to the continuous rise of tourism, many tourism projects are aimed at experiencing the natural scenery of Russia. Most of Russia has not been developed, and it is still in a primitive ecological state, which is very close to nature.
As long as you travel to Russia with the tour guide, the tour guide will remind you not to go near the nearby cabin, which can not help but arouse people's curiosity. What's terrible in the cabin? You only see a sign in front of the door with a string of words written on it, but if you don't know Russian, you can't understand what it means at all.
I didn't know what this cabin was for until I asked the tour guide. Russia was originally vast in land and rich in underground resources. These underground coal mines attracted many developers to develop them. Most of these developers are privately developed, and most of them secretly develop these underground resources to earn more profits, which leads to a large number of local caves. In order to make these caves less empty, they built cabins on these wooden caves and left them in front of the door. Oxygen in the holes behind these wooden houses is very scarce and even harmful. As long as you curiously enter this wooden house, you may lose your life. That's why tour guides don't encourage them to go near these cabins.
The most important thing in traveling is to be happy. We must warn local people and tour guides to withdraw cash and not to do anything dangerous because of our curiosity.