Derived directly from US motorcycle boardtrack (motordrome) racing in the early 1900s, the very first carnival motordrome appeared at Coney Island amusement park in (New York) in 1911. The following year portable tracks began to appear on traveling carnivals and in 1915, the first "silodromes" with perpendicular walls were seen. These motordromes with perfectly straight walls were soon dubbed the "Wall of Death." This carnival attraction became a staple in the US outdoor entertainment industry with the phenomenon reaching its zenith in the 1930s with more than 100 motordromes on travelling shows and in amusement parks.