The World’s 30 Most Impressive Megaprojects
Gotthard Base Tunnel, Switzerland
A new world’s longest and deepest rail tunnel cuts through the mountains in Switzerland. Construction went on for nearly 20 years, but the Gotthard Base Tunnel inside the Swiss Alps finally opened in 2016, moving rail cars of passengers and freight between Zurich, Switzerland, and Milan, Italy. At 35 miles long and dipping about 7,500 feet below the mountain peaks above it, the Gotthard Base Tunnel eliminates the need for winding mountainous routes by offering the first flat-track route through the Alps.