It marks the 20th anniversary of the opening of the Channel Tunnel . The 24.5-kilometer Laerdal Tunnel in southern Germany is the world 's longest road tunnel . The ride is apparently meant to represent a journey to the core of the earth , and the tunnel currently ranks as one of Shanghai 's top five tourist attractions . At 100 feet below sea level the Seikan Tunnel is the longest and deepest rail tunnel in the world .
It marks the 20th anniversary of the opening of the Channel Tunnel . The 24.5-kilometer Laerdal Tunnel in southern Germany is the world 's longest road tunnel . At 100 feet below sea level the Seikan Tunnel is the longest and deepest rail tunnel in the world .