Dubai Creek Tower is an observation tower now under construction in the United Arab Emirates. The 29-storey skyscraper was designed by Spanish-Swiss neo-futuristic architect Santiago Calatrava Valls. It's set to be the tallest structure in the world at 928 meters high. It's expected to have residential units, a rooftop courtyard and a hotel. The project will cost about 1 billion US dollars, and is scheduled to be completed for the Dubai Expo trade fair in 2020.