This is a night shot of the tallest twin tower in the world - Petronas Twin Tower. In addition, they lay claim to being the world's tallest high rise of the 20th century. The foundation under each tower is a 4.5 meter thick, 32,500 tonne raft containing 13,200 m³ of grade 60 concrete, supported by 104 barrette piles driven into the soft rock. The 88-floor towers are constructed largely of reinforced concrete, with a steel and glass facade designed to resemble motifs found in Islamic art, a reflection of Malaysia's Muslim religion. They were built on the site of Kuala Lumpur's race track. Because of the depth of the bedrock, the buildings were built on the world's deepest foundations. The 120-meter foundations were built by Bachy Soletanche, and required massive amounts of concrete.