Gigantic rotary excavator
This is modern rotary excavator, which is used in mining quarries. These machines have enabled people to extract minerals and thereby change the shape of the Earth’s surface radically new way. The biggest one is about two hundred meters (600 feet) long and a hundred meters (300 feet) tall. One rotary excavator could dig a football field sized pit more than hundred feet deep in just one day.
This is how these things look at work: