In this April 17, 2018 photo competitors create light trails in front of the Matterhorn mountain when climbing at the start of the 21st Glacier Patrol race in Stafel outside the ski resort of Zermatt, Switzerland. The Glacier Patrol (Patrouille des Glaciers in French), organized by the Swiss Army, takes place from April 17 to 21. Highly-experienced hiker-skiers trek for over 53km (3994m ascent and 4090m descent) along the Haute Route along the Swiss-Italian border from Zermatt to Verbier. (Valentin Flauraud/Keystone via AP), APTOPIX