Colossus is a 180-foot tall (54.9 m) Ferris wheel located at the 1904 World's Fair section of Six Flags St. Louis in Eureka, Missouri.

[1] Colossus was originally debuted at the 1984 New Orleans World's Fair,[1] under the name "Giant Wheel" in the Bayou Plaza area of the fairgrounds.

In 1992, 2,200 lights were added to the ride for the main season, which displayed a 24-pattern performance with a starburst finale.

During the months that the park was closed, they displayed a giant clock face which was visible to those passing on nearby Interstate 44.

Colossus was the most difficult ride to release riders from, because, with no power, it had to be manually cranked to get the passengers to the ground, which took about 75 minutes.