This is definitely a must see in Zermatt! Take the Train from Zermatt up to Gornergrat and enjoy the faboules view!
The ride is CHF 29.50 (return, with half price) and worth it.
Here is the actual Glacier. Right next to it is the Monte Rosa Massif, containing Switzerland's highest peak, Dufourspitze at 15,203 feet (4,634m).