100 years ago today, President Calvin Coolidge invoked the Antiquities Act to protect Glacier Bay, a long narrow fjord bisecting the Fairweather Range and Takhinsha Mountains lined with the mouths of glaciers. Originally established as Glacier Bay National Monument, the inestimable value of the unspoiled Alaskan coastal ecosystem saw the property expanded into a National Park and Preserve, and eventually a UNESCO Natural Heritage Site one of the largest on Earth at 3.3 million square miles