Editor’s Note — Sign up for Unlocking the World, CNN Travel’s weekly newsletter. Get news about destinations opening and closing, inspiration for future adventures, plus the latest in aviation, food and drink, where to stay and other travel developments.

(CNN) — In travel news this week, Spain is offering free train journeys, Southwest Airlines is making its vouchers valid forever, and we take a look at the world’s greatest hiking trails and Iceland’s best

 
Editor’s Note — Monthly Ticket is a CNN Travel series that spotlights some of the most fascinating topics in the travel world. In July, we’re hitting the trails to explore the world’s greatest hikes.

(CNN) — From a multi-day trek tracing the routes of a Japanese poet, to a classic clamber in the Argentinian Lake District, there are thousands of incredible trails that allow us to get up close to nature.

Walking boots and waterproof