After six years of construction, the 555-meter-tall (1,820 ft) Lotte World Tower opened in April, setting three world records and redefining the Seoul skyline.
Not only is it the tallest tower in South Korea and fifth highest in the world -- dwarfing the Korean capital's next highest building, Three IFC Office Tower, by nearly 300 meters -- it's also home to the highest glass-bottom observatory at 478 meters (1,568 ft).
But its most impressive feat?
The Lotte World Tower features the world's tallest and fastest double-decker elevator, the Sky Shuttle, which whisks passengers from the basement to the 121st-floor observation deck in one minute, or at 10 meters per second.
From the top of the half kilometer-tall tower, visitors can survey the edges of Seoul's vast urban sprawl and the mountainous terrain beyond -- only a handful of other skyscrapers in sight.