The inverted roller coaster was pioneered by the Swiss rollercoaster designers Bolliger & Mabillard, who also created the first floorless roller coaster. In 1992, the first inverted track roller coaster opened at Six Flags Great America in Gurnee, Illinois. This rollercoaster, Batman: The Ride, has since been "cloned" at least 10 other amusement parks including many Six Flags parks. Cloning is the word Roller Coaster Enthusiasts use to describe the process of building a roller coaster at one theme park with the exact same track layout as a roller coaster at a different theme park. Many inverted roller coasters with unique track layouts have been added to other parks. The tallest inverted roller coaster is Alpengeist at Busch Gardens Williamsburg with an initial height of 195 feet (59.4 meters). The greatest number of inversions an inverted rollercoaster has is seven (Montu at Busch Gardens Tampa ).