Located in South Africa, the mine is considered one of the largest artificial caves in the world.
In fact, it was a small hill at first. In 1866, more than 50,000 miners began to dig and dig. By 1914, the Kimberley Diamond Mine had penetrated 213 meters below the ground and the width exceeded 457 meters.
The mine produces more than 6,000 pounds of diamonds (1 pound or about 0.5 kilograms) and is now a tourist destination.