The most important contributors to a roller coaster's ability to instill fear in its patrons are its speed and height. The minds behind the Kingda Ka at Six Flags Great Adventure in Jackson, New Jersey clearly understood this, as they combined speed and height to create the scariest roller coaster in the world.

Formula Rossa — Ferrari World, Dubai, United Arab Emirates Designed to look similar to a sports car, this roller coaster soars through the sky at speeds of 149.1 miles per hour making it ranked the fastest coaster in the world. The ride can also reach those max speeds in just five seconds.

Kamikaze. On the other hand, the Kamikaze (also known as the Hammer) is one of the scariest carnival rides. With a hammer-like look, the Kamikaze is a pendulum that swings back and forth in a massive sweeping motion. Passenger cars are located on the end, where the g-forces are highest.

Carousel or Merry-go-round The ride consists of a rotating platform with seats that move up and down. The “seats” are traditionally in the form of rows of wooden horses or other animals mounted on posts, many of which are moved up and down by gears to simulating galloping, to the accompaniment of music.