Tunnel Vision

a tunnel-boring machine in Switzerland's Gotthard Base Tunnel Getty Images

Twenty of the more eye-catching tunnels in the world, including the tree-covered "Tunnel of Love" in Ukraine, the three-story-deep Cu Chi Tunnels in Vietnam, and the 17-mile-long Large Hadron Collider in Switzerland (slideshow): http://www.weather.com/travel/worlds-most-amazing-tunnels-20130213?pageno=1