Young people attending World Youth Day 2016 in Krakow, Poland, will have to walk 18 miles in total to and from one of its key sites, event organisers said.
"They'll have to be ready for a long foot journey of several hours, but this has always been a feature of World Youth Days," said Anna Chmura, WYD's communications coordinator.
"There'll be several designated routes, mostly from Krakow, and they'll all be used heavily. But we're confident the logistics and security have now been carefully worked out," she told Catholic News Service.
