Fehmarnbelt Tunnel will be the world’s longest immersed tunnel

Fehmarnbelt Tunnel will be the world's longest immersed tunnel

Editor’s Note — Monthly Ticket is a CNN Travel series that spotlights some of the most fascinating topics in the travel world. September’s theme is ‘Build it Big,’ as we share the stories behind some of the world’s most impressive feats of engineering. (CNN) — Descending up to 40 meters beneath the Baltic Sea, the … Read more