Hikers on ancient path used by villagers to cross the island North to South, on the heights of Santana, Madeira island, Atlantic Ocean, Portugal

Basket ferns, Epiphytes, on tree in Barron Gorge National Park, Queensland, Australia

People hike towards Root Glacier in Wrangell-St. Elias National Park, where they will learn ice climbing, Kennicott, Alaska, USA

An ice climbing class on the Root Glacier in Wrangell-St. Elias National Park, Kennicott, Alaska, USA

An ice climbing class on the Root Glacier, in Wrangell-St. Elias National Park, Kennicott, Alaska, USA

A man swings his ice tools as he climbs out of a moulin on a day trip with St. Elias Alpine Guides to the Root Glacier in Wrangell-St. Elias National Park, Alaska.

A woman swings her ice tools as she prepares to climb out of a moulin on a day trip with St. Elias Alpine Guides to the Root Glacier in Wrangell-St. Elias National Park, Alaska.

A woman ice climbs on Root Glacier in Wrangell-St. Elias National Park with Mt. Blackburn in the background; Alaska, United States of America

Guided groups recreate on Root Glacier in Wrangell-St. Elias National Park; Alaska, United States of America