The Channel Tunnel, a ground link between England (Falkestone) and France (Calais), cost approximately $15 billion and is 31 miles in length, of which 23 miles are underwater. The Channel Tunnel consists of three interconnected tubes, two one way rail lines and one service tunnel. Only trains are allowed through. Vehicles may not be driven through the Chunnel.
Cairo Metro Line 2, Egypt: A 30km underground railway line linking the pyramids of Giza on the web bank of the Nile to central and northern Cairo on the opposite bank.
Maui & Kauai, Hawaiian Islands
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