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13. Project Oresund Tunnel
Location: Copenhagen, Denmark, and Malmö Sweden
Total Cost: $10 Billion*
Year Finished: 2000
Everyone who witnesses Copenhagen's Oresund Tunnel Project gasps in awe. A combination railway and road bridge spans the Oresund Strait to link Sweden and Denmark. With a length of about five miles, the tunnel is one of the longest in Europe and cost an astounding $10 billion to build.
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Oresund Tunnel Project (Wikimedia Commons/©Nick-D)
The genuine engineering marvel is the way this massive structure, which connects the Swedish coast to the artificial island of Peberholm, successfully combines a roadway and a railway. This transition between coasts and straits is completed by the 2.4-mile Drogden Tunnel, which provides a smooth link between Peberholm and the Danish island of Amager.
