Five facts about Burj al-Arab you don not have to know: #1 If one man was to build it himself, it would take about 8000 years to finish. #2 It takes one full month and 19 people to clean all windows of the building. #3 The restaurants use 10 tons of chocolate per year. #4 There are 29,000 Swarovski crystals in the ceiling of the lounge, which are designed in the shape of the Milky Way. #5 Yes, that is the building where Andre Agassi and Roger Federer stunt an amazing tennis match on the helipad at a height of 210 m (689 ft) above ground in 2005. #Traveltip: The average price tag for the Royal Suite is $24,000 PER NIGHT!