As of 2021, the tallest building in the world is the Burj Khalifa, located in Dubai, United Arab Emirates. Standing at 828 meters (2,717 feet) tall, it was officially opened on January 4, 2010. The Burj Khalifa was designed by the architectural firm Skidmore, Owings & Merrill, with Adrian Smith as the architect. It features a mix of residential, commercial, and hotel spaces, alongside observation decks that offer stunning panoramic views of the city and beyond. The building symbolizes Dubai's rapid development and architectural ambition.