2014 marks the 20th anniversary of the opening of the Channel Tunnel . The 24.5-kilometer Laerdal Tunnel in West Norway is the world 's longest road tunnel . Hide Caption 1 of 10 Photos:Photos: Norway's Channel Tunnel opens to traffic
2014 marks the 20th anniversary of the opening of the Channel Tunnel . The 24.5-kilometer Laerdal Tunnel in West Norway is the world 's longest road tunnel . At 460 feet below sea level the Seikan Tunnel is the longest and deepest rail tunnel in the world .