Hanging out, extreme edition.

• Position: THE BIG PICTURE

This picture, taken in Bosnia and Herzegovina in September, gives new meaning to the term hanging out. These 19 daredevils, suspended more than 650 feet above the Tijesno Canyon, are practicing "hammock highlining," which combines elements of zip-lining, mountain climbing, and tightrope walking. It was part of the Drill and Chill Climbing and Highlining Festival, an annual gathering of people who love extreme vertical sports, which have gained in popularity over the past two decades. To set up, the participants anchored a line to two mountains...