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The 123-story Lotte World Tower may not be the tallest building in the world—it’s in fifth place-but it’s got a few record-breaking statistics up its sleeve.

More info: bloomberg.com

Inside The World’s Newest Mega-Skyscraper

After almost seven years of planning and 4 trillion won ($3.6 billion) in spending

The tower is twice the height of its nearest Seoul rival and is the tallest building in South Korea

If you’re feeling queasy, don’t look down! The glass-floor observation deck on the 118th floor gives visitors a bird’s eye view of the city

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A tunnel carries visitors to the observation deck.

The timing’s not great, however.

Other facilities at the site include a spectacular concert hall with seating for 2,000 people, an aquarium, cinema and food hall.

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The Lotte World amusement park as seen from the 102nd floor of the Lotte World Tower, during construction.

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From up in the air to under water.

Lotte World Tower celebrate its opening with a fireworks show on April 2.