10. Chuki Camata copper mine-Chile.
Chuji Camata copper mine is a famous open-pit copper mine, which produces the most copper in the world, with a depth of more than 850 meters. It has been mined for centuries and is the oldest copper mine in Chile and one of the top ten grottoes in the world.
9. Yudaknaya Diamond Mine-Russia
Yudaknaya diamond mine is a Russian diamond mine. It was discovered in 1955, stopped operating in 20 10, and turned to underground mining. The mine is more than 600 meters deep, which is a cave that human beings want to find out and one of the top ten strange caves in the world.
8. Tiankeng-Guatemala
In 2007 and 20 10, it collapsed twice, forming a huge pit with a diameter of 20 meters and a depth of about 90 meters. The reason is that the rocks in the sewer are decomposed, and some local residents have already evacuated from the area, making it one of the top ten strange caves in the world.
7.Diavik Mine-Canada
Diavik mine is located in the northwest of Canada. It produces 1600 kg of diamonds every year, and its life is expected to be 16 to 22 years. In winter, the mouth of the cave is covered with thick snow, and the wellhead water is frozen. Seen from high altitude, it is very beautiful and is one of the top ten strange caves in the world.
6. Milne Diamond Mine-Siberia
Milne diamond mine is 525m deep and1200m in diameter. It has the reputation of "Russian diamond capital" and is the diamond production base of the former Soviet Union. Seen from the sky, the typical whirlpool cave, which once produced 23% of the world's total diamonds, has now been abandoned, with 45 meters of gravel at the bottom, making it one of the top ten strange caves in the world.
5. Big Blue Hole-Belize
The Great Blue Cave is actually a limestone cave, a famous underwater cave, ranking fourth in the known world. The depth is close to 137 meters, and the stalactites in the cave have beautiful scenery. It is one of the famous diving sites in the world and one of the top ten strange caves in the world.
4. Bingham Canyon Copper Mine-Utah
This is a world-famous mine with a depth of1200m and a width of 4000m. It is one of the largest artificial excavation projects in the world and one of the man-made landscapes visible in outer space, and its size is also amazing. The output of ore has exceeded17 million tons, gold 23 million ounces and silver10.9 billion ounces, making it one of the top ten grottoes in the world.
3. Monteiro Dam-California
It is a large-scale circulating spillway in the United States, known as Glorious Cave, and one of the seven Ushizo caves in the world. When it is fully opened, the outflow of Monticello can reach 1370 cubic meters per second, and the water in the reservoir is mainly supplied to the North Bay area of San Francisco, making it one of the top ten strange caves in the world.
2. Kimberly Diamond Mine-South Africa
Kimberly Diamond Mine claims to be the world's largest hole excavated by hand (controversial, from 1866 to 19 14, 50,000 miners excavated by hand, and produced 2,722 kilograms of diamonds. With a depth of 1097 m and an entrance diameter of about 500 m, the mine is currently open to the outside world as a tourist attraction and is one of the top ten strange caves in the world.
1. Dalva gas pit-Turkmenistan
Known as the "Gate of Hell", the natural gas pit is located near Davaz, a small town in southern Turkmenistan, in the desert. Even in the dark, the fire can be seen several kilometers away. This is a natural gas drilling accident. It is an underground cave with a diameter of about 60 meters and a depth of 20 meters. The fire has been burning for decades, and many tourists come to watch it every year. It is one of the top ten strange caves in the world.