1. Burj Khalifa At the Top — Downtown Dubai
The world's tallest building, with decks at 456 and 555 meters.
The official site describes the At the Top observatory at 456 meters on levels 124 and 125, and At the Top SKY adds level 148 at 555 meters, which it calls the highest deck in the world.
Sunset is the most popular slot. Compare it with a morning slot if you want fewer people and cooler light.
Good to know: Book a timed ticket online and choose a clear-day slot; haze can hide the view in summer.
1 Mohammed Bin Rashid Boulevard, Downtown Dubai, Dubai, UAE