A group of climbers in Cedar Falls, Iowa braved the cold temperatures to scale a frozen silo.
Some climbers did it for class credit at the University of Northern Iowa.
Others did it for the heck of it.
"It's just really fun getting up really high and ice climbing," 10-year-old Will Bickel said.
"I think it's a new experience and people should be open to trying it because you can get really into it," 11-year-old Seamus Thompson added.
All the climbers used safety gear.