Singapore National Stadium in Tanjong Rhu, Kallang holds the world record as the largest dome structure, measuring 1,017 feet in diameter. The stadium officially opened in June 2014. The Dome's roof is retractable and takes just 20 minutes to close or open it covers 95% of the seats and is made of revolutionary all-weather resistant materials. It blocks the heat from the sun and rain as well. The roof also doubles up as a giant projector screen. The lower tier seats are also retractable either mechanically or automatically, making it the only stadium capable of hosting a multitude of events like rugby, athletics, football and many others. The stadium has a sitting capacity of 55,000 people, with an innovative cooling system which is pumped from the underneath the seats consuming 15% less energy than comparable stadiums.