The tower, which contains offices, galleries, retail spaces and a luxury hotel, features the Seoul Sky Observatory at its apex – this includes a skywalk that's the highest glass-floored observatory in the world at 1,568 feet (478m) high and an observation deck where incredible views of Seoul await.

Those wishing to go a step further can sign up for the SKYBRIDGE experience, where you'll walk (safely harnessed) across the bridge that connects the two structures right at the peak of the tower. For a more sedate experience, enjoy the thrilling views of the capital from the café on its 123rd floor.

The world's highest observation decks you can visit