Walking on the Root Glacier: scale is hard to believe

Look for the tiny dark shapes in the middle of the frame. Those are people, on the Root Glacier in Alaska. This is the National Park Service's photo and it's still the best sense of scale I've seen.
Anybody done a guided ice walk there?
Photo: National Park Service, Alaska Region, Public domain. Source
@hollis_grant · Core contributor
It took me way too long to find the people. Then my stomach dropped a little.