London, England: Tower Bridge

London had a problem in the late 19th century. It needed another bridge across the Thames. The catch was, the city couldn't build a typical bridge because that would mess up shipping to the port areas.

The Tower Bridge was the solution. It has the elements of a drawbridge, so that large ships (like the one shown, I guess) could pass through safely.

A total of 40,000 people still cross it every day, in one form or another, with a speed limit of 20 mph for vehicles. Some stop at an exhibition for a quick lesson in the structure's history. And the bridge is still raised about 1,000 times a year to allow ships to pass through. At least 24 hours notice is required.

Care to see what it looks like when opening?

 

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