Vortex (Kings Island)
Vortex is a steel roller coaster at Kings Island in Mason, Ohio. It was designed and built by Arrow Dynamics. It cost $4 million. The ride officially opened to the public on April 11, 1987. When it opened, Vortex was the tallest, full-circuit roller coaster with the highest drop in the world. It was also the first one where riders are upside down six times.