The Burj Khalifa in Dubai, United Arab Emirates is the world's tallest building at 828 meters tall. It has 163 floors and took over 6 years to build from 2004-2010 at a cost of $1.5 billion. The Burj Khalifa holds numerous records for height, floors, and other superlatives such as the highest outdoor and indoor observation decks. It was designed by architect Adrian Smith and developed by Emaar Properties.