You’ve probably seen slackliners at the park, balancing a few feet above the ground on a thin strap strung between a pair of trees. Highlining is the same idea, except Hayley Ashburn walked over 170 feet between mountain peaks, over 9,000 feet above the ground.
Source: Gizmodo – Highlining Between 9,000-Foot-Tall Mountain Peaks Takes a Special Kind of Courage