6Lotte World Tower – Seoul, South Korea

Lotte World Tower reaches 555 meters with 123 floors. Its curved glass exterior offers panoramic views of Seoul and the Han River. Inside, there is a luxury hotel, offices, and an observation deck on the 117th–123rd floors.
The skywalk at the top lets brave visitors step onto a glass floor and look straight down. During winter, the tower is often surrounded by fog, making it look like it floats above the city.