Grasshopper Glacier, in the Beartooth Mountains in Montana, is a most unusual natural phenomenon.
Huge swarms of grasshoppers have been trapped in the ice of a glacier for more than 300 years.
This oddity was discovered in 1898 during a scientific expedition in the northern Rockies near Granite Peak, not far from Yellowstone National Park.
One of the scientists noticed a strange looking section of ice with a surface that looked like elephant skin.
When he got closer, he saw that its unusual appearance was caused by hundreds of dead locusts locked inside.
Scientists think that the insects may have been flying over the area when they were caught in a storm.