A big rotating upright wheel with passenger cars attached to the rim.
1The 60-metre high observation wheel was unveiled by developer Harry Crosbie in July.
2Harrah's is seen behind the High Roller observation wheel in Las Vegas, Nevada March 31, 2014.
3A view of the 550-foot-tall High Roller observation wheel in Las Vegas, Nevada March 31, 2014.
4An evening view of the 550-foot-tall High Roller observation wheel after opening in Las Vegas, Nevada March 31, 2014.
5The first cabin of public riders is shown on the 550-foot-tall High Roller observation wheel in Las Vegas, Nevada March 31, 2014.
6A passenger of the Singapore Flyer observation wheel is rappelled down from a capsule during a rescue operation in Singapore December 23, 2008.