A model shows The Tower at Dubai Creek Harbour, which will be the world's tallest tower when completed in 2020. Dubai's developer giant Emaar Properties announced plans to build the viewing tower in April, saying it will be "a notch" higher than Burj Khalifa, which stands 828 meters high. Emaar has not revealed the exact final height of the tower. It said in April that the structure will cost around $1 billion. Designed by Spanish-Swiss architect Santiago Calatrava Valls, the tower will have observation decks providing 360-degree views of the coastal city. (Photo/Xinhua)
