24 Famous places to visit before they disappear

Glacier National Park, Montana

Extending over 4 sq km (1.6 sq mi) on the US-Canada border, the Glacier National Park was once littered with hundreds of glaciers. About a hundred years ago, there were still 150 of them. By 2005, only 27 remained and they are expected to vanish within a few decades. The glaciers have been an important part of the park´s fragile ecosystem, providing home to numerous animal and plant species.