Skateboarding is one of the most popular extreme sports in 21st century America. The roots of skateboarding began in California back in the 1950s when young adults used to surf the streets on wooden boards (and there were certainly no skate parks in those days!). Skateboarding really took off in the 1970s and became part of the mainstream in the late 1990s thanks to the success of Tony Hawk, video games and the X Games. Since then, impressive skate parks have been built all over the country (and the world), and here we’ll rank the top 10...