Every year, thousands of visitors come to marvel at Perito Moreno's towering crystal mass. Recent visitors suggest mini-trekking (a type of hiking excursion) along Perito Moreno's southern border.

The Perito Moreno Glacier stretches over 100 square ... There are also several hiking paths that take trekkers around the glacier's edge if the idea of walking on its surface sounds too risky.

Friday, March 21 marks the inaugural World Glacier Day, an international observance established by the United Nations to raise awareness about the rapid retreat of glaciers worldwide.