Lotte World Tower soars 1,821 feet above Seoul, South Korea's modern capital.

This 123-story multipurpose skyscraper — which cost a staggering $2.5 billion USD to build — encompasses office, retail, tourism, and residential spaces. Its design was ambitious, with complex structural challenges that required engineers to ensure that the finished skyscraper would withstand a magnitude 9.0 earthquake or hurricane-force winds. The tapered design and use of high-strength concrete and steel helped to achieve these needs yet still facilitate the open floor plans tenants prefer. For tourists, Lotte World Tower is home to one of the planet's highest observation decks, the Seoul Sky observatory, which is situated 1,640 feet above ground.

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The Top 15 Busiest Highways in the U.S.

Many of us rely on our cars to get from point A to point B every day, which means it's rare for us to find ourselves alone on a highway. But have you ever stopped to wonder which roadways have the worst traffic? Discover the top 15 busiest highways in America.

Is It Safer To Fly During the Day?

Have you ever given much thought to how pilots in the flight deck navigate at night? Here's how flying an airplane when it's light out compares with navigating after dark.