Where you may ask? Why Southern California at Six Flags of course!
This from the LA Times:
"The Green Lantern will bring Magic Mountain's coaster count to 18, allowing the Valencia amusement park to recapture the coaster crown, taken by Ohio's Cedar Point in 2008.
The Green Lantern vertical coaster, with green zigzag track and black supports, will sit on a compact footprint near the Batman and Riddler's Revenge coasters. The new-concept 4th dimension coaster, similar in style to X2 but more tame, will reach a top speed of 37 mph over 825 feet of serpentine track during the two-minute ride."