A little after the Grossglockner mountain pass (the peak of the mountain), you'll see directions to a place called Franz josef Hohe. It is an observation point, along with stores, restaurants, and of-course, a beautiful view. It is recommended to stop, eat and rest a little. In the top floor of the tower, you'll find a small restaurant overlooking a giant iceberg. The food is quite boring and is centered mainly around french fries, but the view definitely makes sitting there worthwhile.
If you are brave enough, you can climb down to a large iceberg called Pasterze. The descent is by cable car, and the walk there is a walk in the icy snow, and so you must equip yourself accordingly (coats, gloves, wool hats, etc...). If you do not have the proper clothing, we recommend you not to do this.