Not ranked: Dubai Eye - 689 ft. (210 m)
The United Arab Emirates city already has the world's tallest building. And it will soon have the world's tallest observation wheel (until the next big one comes along). It's unclear when it might open, but construction has begun, and the Dubai Eye could be spinning by late 2015 or early 2016. It will be located on a man-made island.
Not ranked: New York Wheel - 625 ft. (191 m)Scheduled to open in 2017, plans call for the New York Wheel to be located on the banks of Staten Island, near the dock of the Staten Island Ferry. It would offer incredible views of the Manhattan skyline. At a cost of $230 million, the wheel would accommodate an impressive 1,440 passengers per ride. The length of the ride would be an estimated 38 minutes.
Number 1: High Roller - 550 ft. (168 m)
Located at the LINQ Hotel and Casino along Las Vegas' famed Strip, the High Roller opened in 2014. Each cabin holds up to 40 passengers.
Number 2: Singapore Flyer - 541 ft. (165 m)
Opened in 2008 along Marina Bay in Singapore, the enormous wheel provides views of nearby Malaysia and Indonesia. Each of the 28 capsules capsules is about the size of a mini-bus and can hold 28 riders
Number 3: Star of Nanchang - 525 ft. (160 m)
Located at the Nanchang Star Amusement Park in Nanchang, China, the Star wheel opened in 2006. Each of its 60 climate-controlled cabins can accommodate up to 8 passengers. The wheel has a number of lighting displays and puts on an amazing show at night.
Number 4: London Eye - 443 ft. (135 m)
Opened in 2000 along the River Thames in London, the attraction was originally known as the Millennium Wheel. Each of its 32 capsules can carry 25 passengers, and the single-rotation experience lasts about 30 minutes. Operated by Merlin Entertainments, combo tickets are available to visit other London attractions, including Madame Tussauds, the SeaLife Aquarium, and the The London Dungeon
Number 5: Orlando Eye - 400 ft. (122 m)
The Orlando Eye, opened in 2015, provides spectacular views of the area's theme parks, including nearby SeaWorld Orlando and Universal Orlando. It is one of the tallest rides in Florida (although, remarkably, not the tallest).
Number 6 : Melbourne Star and 5 Others - 394 ft. (120 m)
There are a number of wheels that stand 394 feet tall:
7 .Sky Dream Fukuoka opened in 2002 in Fukuoka, Japan
8. Zhengzhou Ferris Wheel opened in 2003 at Century Amusement Park in Henan, China
9. Changsha Ferris Wheel opened in 2004 in Changsha, China
10. Tianjin Eye opened in 2008 at Yongle Bridge in Tianjin, China
11. Melbourne Star opened in 2008 at Docklands in Melbourne, Australia
12. Suzhou Ferris Wheel opened in 2009 in Suzhou, China