Today's ride designers are taking Ferris wheels to new levels. Take a guess at the height of the world's biggest observation wheel. Then see if your guess comes close to the actual number.

- The World's Steepest Roller Coasters

The 2015 Vacation reboot, a road trip movie featuring the next generation of the doofus Griswold family, is now available on demand and on DVD. As in the 1983 original, the theme park, "Walley World," plays an important role. For park fans, the films raise an interesting question. Is Walley World an actual place? Let's break it down.

In the 1983 version of Vacation, two roller coasters are prominently featured: "Screaming Mimi" and Revolution. The actual rides are at Six Flags Magic Mountain and have both been recently transformed by the park. The New Revolution will debut soon with new trains, new restraints, a spiffed-up track, and a wild virtual reality experience. Last year, Six Flags radically changed "Screaming Mimi"/Colossus into the incredible steel-wood hybrid coaster,Twisted Colossus. Read my 5-star review.