Looking at Seoul from 118 stories up.
If you're looking to truly feel like you're walking on air, head to Seoul. There you'll find the world's tallest glass-bottomed observation deck.
Measuring in at 1,640 feet, the Lotte World Tower Observation Deck is located in the fifth tallest building in the world (it's got 123 floors total). According to Bloomberg, the skyscraper opening on April 3 was seven years in the works. The entire project cost $3.6 billion to make — but that's the cost you'll get for taking the honor of tallest glass floor and highest swimming pool.
Getting to the top takes less than a minute of elevator time, and the awaiting views are stunning spans of the surrounding city, and then some. The observation deck itself is on the 188th floor, producing some mind-boggling views if you look straight down.
Aside from the observation deck, the tower will also include shops, a food hall, a concert hall with room enough for 2,000 people, a movie theater, and an aquarium, according to Bloomberg. There's also an amusement park on the property, if you like your adventure closer to the ground.
For more information on the observation deck and the Lotte Tower, head to the architect behind the massive tower's website.