>How about the Confederation Bridge that connects Prince Edward Island to New Brunswick. It was completed in 1997 for a cost of $1 billion (CDN). It spans eight miles and is the world's longest bridge over ice-covered water.
>
>http://confederationbridge.com/en/index.php
>
>
>>http://www.telegraph.co.uk/news/worldnews/asia/china/8248197/China-builds-worlds-longest-bridge.html
>>
>>4 years, 26.4 miles, £5.5billion~$8.8billion = $208million/mile
>>
>>By comparisson : consider the new East Span of the SF Bay Bridge
>>
>>11 years 2.2 miles, $5.487 billion (est) = $2.494billion/mile
>>http://baybridgeinfo.org/faq
>>
>>10x more cost efficient = A thumpin!

The Chesapeake Bay Bridge Tunnel
23 miles, 2 tubes, 4 islands, 4 years each direction, $450 million
"One of Seven Engineering Wonders of the Modern World" in 1965
http://www.cbbt.com/facts.html