The Burj Khalifa, the world's tallest structure, officially opened in Dubai.

The Burj Khalifa is a megatall skyscraper located in Dubai, United Arab Emirates. With a total height of 829.8 m and a roof height of 828 m, it is the world's tallest structure. It also has held the record of the tallest building in the world since its topping out in 2009, surpassing the Taipei 101, which had held the record since 2004.

The tallest structure in the world is the Burj Khalifa skyscraper at 828 m (2,717 ft). Listed are guyed masts, self-supporting towers, skyscrapers, oil platforms, electricity transmission towers, and bridge support towers. This list is organized by absolute height. See History of the world's tallest structures, Tallest structures by category, and List of tallest buildings for additional information about these types of structures.

Dubai is the most populous city in the United Arab Emirates and the capital of the Emirate of Dubai. It is located on a creek on the south-eastern coast of the Persian Gulf. As of 2025, the city population stands at 4 million, 92% of whom are expatriates. The wider urban area includes Sharjah and has a population of 5 million people as of 2023, while the Dubai–Sharjah–Ajman metropolitan area counts 6 million inhabitants.