Top 10 tallest structures

Don't look down! 125 years after French engineer Gustave Eiffel designed his eponymous tower, tourists still flock to Paris to climb it. Here's a look at our 10 favorite tall structures from around the world.

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  Gateway to the Wild West

  The St. Louis Arch in Missouri is another popular tourist sight in the United States. At 192 meters it looms over the Mississippi River, marking the gateway to the American West. Finished in 1965, the arch was considered an engineering marvel and is still one of the world's tallest stainless steel and concrete monuments.

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