GOTTHARD BASE TUNNEL - SWITZERLAND

The Gotthard Base Tunnel is the longest and deepest railway tunnel in the world. It has a length of 35.47 miles and depth of 8,040 feet, comparable to that of the deepest mines on Earth. The tunnel cost more than $12 billion to build and took 17 years to complete. It opened in 2016 and provides a high speed-rail link under the Swiss Alps between northern and southern Europe. At the opening of the tunnel, a lavish show was performed with dancers, acrobats, singers and musicians celebrating Alpine culture and history. (See below).