The High Roller recently opened in Las Vegas, USA. It is the world’s tallest observation wheel (168 meters or 550 feet tall). It takes 30-minutes for the wheel to rotate once. It can hold up to 1,120 people. The previous record holder was the Singapore Flyer (in Singapore), which is just 3 meters shorter.
Image Credits: http://www.thelinq.com/ for High Roller’s image