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10 Plane Crashes That Changed Aviation

Midair collisions, on-board fires, a fatigued fuselage that turned a plane into a high-altitude convertible—out of these tragedies arose major technological advances in flight safety that keep air travel routine today.

7 Non-famous Engineering Wonders of the Modern World

Would you believe that the tallest bridge in France reaches higher than the Eiffel tower, or that a single dam in China can hold back 1.4 trillion cubic feet or water? Each of the projects depicted here has set at least one world record for its height, scale, daring or ingenuity. From Venice to Boston,