At 829.8 metres, Burj Khalifa is the largest building in the world! And it is undoubtedly the city's most iconic spot to visit. A visit to the observation deck on the 124th floor is a must for all visitors, particularly in the evening. The design was conceived by Adrian Smith, an architect based in Chicago, for $4 billion. Within the Burj Khalifa are the highest mosque and swimming pool in the world, while the uppermost spectator platform is on the 124th level. Inside, there are offices, apartment complexes, convention centres and various entertainment options. While there, don't forget to visit the nearby dancing fountain, which remarkably syncs water, music and light!