Dubai began construction work Monday on a tower that will stand higher than its Burj Khalifa, which is currently the world's tallest skyscraper. <br /> <br />The Gulf emirate's ruler, Sheikh Mohammed bin Rashid al-Maktoum, marked the groundbreaking of The Tower at Dubai Creek Harbour as construction workers laid foundations for the skyscraper at a vast patch of sand. <br /> <br />The structure "will be the world's tallest tower when completed in 2020," said a statement issued at the ceremony. <br /> <br />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 metres (2,700 feet) high. <br /> <br />Emaar has not revealed the exact final height of the tower. <br /> <br />It said in April that the structure will cost around $1 billion (900 million euros). <br /> <br />Designed by Spanish-Swiss architect Santiago Calatrava Valls, the tower will have observation decks providing 360-degree views of the coastal city. <br /> <br />Emaar Chairman Mohamed Alabbar said the tower will completed before the Expo 2020 trade fair which Dubai is preparing to host.
