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Golden Gate Bridge
The Golden Gate Bridge's two main cables are made from more than 80,000 miles of steel wire. That's enough to circle the globe three times! Is this bridge's greatest test yet to come?
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The roads to Machu Picchu aren't built for wheeled vehicles. Instead, they're carefully constructed so that humans and animals can traverse steep cliffs on staircases built into the mountainside.
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Machu Picchu Was Built Without The Use Of Wheels
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Paris has the second busiest Metro hub in Europe but cracks in the rocks could be a serious safety problem. Travel beneath Paris to explore a hidden world underneath the surface.
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This Underground Danger Could Bring Paris to Collapse
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The Eiffel Tower was the tallest structure in the world for more than 40 years. Today, it's the most iconic landmark in Paris. See what lies hidden from the naked eye.
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New Orleans lies up to 10 feet below sea level and is surrounded by water. When a hurricane hits, the city is threatened from all sides
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This Was Built To Protect New Orleans From The Next Katrina
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Hurricane Katrina devastated much of New Orleans in 2005. Many people thought the city's Superdome was indestructible - but it wasn't. Now engineers take innovative steps to stop the next big storm from wreaking havoc.
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