All over the world, huge, awe-inspiring construction projects from skyscrapers to suspension bridges

dominate our skylines.

As you can imagine, these construction projects are built on plenty of blood, sweat, and cold,

hard cash.

But they don't always turn out the way their developers anticipate.

In fact, basic mistakes in multi-million

dollar projects can see new buildings abandoned, bridges destroyed, or entire complexes collapse. So grab

your hard hat and hang on to your wallet as we explore some of the most expensive construction

mistakes in the world.

Currently, there are over 600,000 bridges across the United States. Most of them are pretty old, too, with 42% of all American bridges built before 1970.

Some of those have now been classed as structurally inefficient, but others never lasted long enough for people to realize.

When it opened in 1940, the Tacoma

Narrows Bridge in Washington cost $6.4 million to build. That means if it were

built today, it would cost a whopping $126 million. At the time, it was the third

longest suspension bridge in the world by Main Span.

To put that in perspective, only the famous Golden Gate Bridge in San Francisco and the George Washington Bridge in New York City outspanned this mega project.

With so much money sunk into it, construction workers were alarmed when, during the building

process, the bridge began to move vertically in windy conditions.

The workers continued to follow the design regardless, giving the bridge the nickname galloping

Gertie.

Poor Gertie wouldn't be galloping for long, however, as just over four months after the bridge

opened to the public,

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