The longest tunnel in the world is the Mount St. Gothard Tunnel, Italy. It is 48,840 feet long or nearly 10 miles long.

The Mount Cenis Tunnel, Italy, is next, is 39,840 feet long or about 7 miles long.

The Hoosac Tunnel, Mass., is 25,080 feet long or about 4 1/2 miles long, the longest in the United States.

The Nochistongo Tunnel is 21,659 feet long, or about 4 miles long.

The Sutro Tunnel is 21,120 feet long or about 4 miles long.

The Thames and Medway Tunnel, England, is 11,880 feet long, or about 2 miles long.