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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  The tallest steeple

  Prior to the introduction of steel and concrete, the world's tallest structures were made of brick and stone. Most of these historic tall buildings are churches, blending a mastery of art and architecture. The Ulm Minster in southern Germany, begun in 1377, still boasts the tallest church steeple, which measures 161.5 meters.