The Burj Khalifa is a skyscraper in Dubai, United Arab Emirates. The world's tallest human-made structure is 828 m (2,716 ft 6 in) tall, the Burj is more than twice the height of the Empire State Building, and almost three times the size of the Eiffel Tower. In the course of confirming the Burj as the World’s tallest building, Guinness World Records also ratified a number of other lofty achievements for the ground-breaking structure. The taller a building is the greater the effects of weather, but the neo-Futurist-style Burj Khalifa was designed with a complex Y-shaped cross section to reduce the effect of wind. One of the Burj’s most impressive features is the 555.7-metres-high (1,823 ft 1.9 in) high observation deck, which was formerly the highest in the world until China’s 632-m (2,073-ft) Shanghai Tower opened one at 561.3 metres (1,841 ft) in 2015.