The NASA Earth Observatory published a pair of images showing the dramatic comparison of the Columbia Glacier in Alaska between 1986 and 2014. Valdez and the Columbia Glacier are on the southern coast of Alaska, east of Anchorage. This Google Map view will give you a broad perspective. Zoom in to find them north of Prince William Sound. Here is a screen shot to help you locate them.
The Columbia Glacier was imaged as shown below in 1986 by the Landsat 5 satellite. The east and west branches merged at the medial moraine with the glacier continuing to flow to the south. It terminated near Heather Island. There it calved and broke off chunks into the water.
The glacier was again imaged July 2, 2014. This time Landsat 8 gathered the image. Click this link or the linked image above to see their comparison after 28 years. There is a View Image Comparison button on the linked page you might find useful.
Glacier retreat is a serious problem world-wide resulting from global warming caused by increased CO2 in the atmosphere. More examples of glacier retreat and information about glaciers in general can be found at the National Snow and Ice Data Center.