Looks too peaky to be the North side of Mt. Rainier. The only ice caves I've heard of on Rainier are the long-defunct Paradise ice caves. They also don't look like photos I've seen of the Sandy Glacier ice caves on Mt. Hood (which also have collapsed as the glacier has shrunk). Not being a mountaineer, I don't get that close to glaciers. Lots of other ice caves in the NW, but none that I know about in glaciers.

I even tried googling.... I'm curious!