With the Pikes Peak International Hill Climb kicking off this weekend, we here at TopSpeed are practically giddy at the thought of watching all those high-powered machines take on one of the most exciting, long-running, and flat-out challenging motorsports events in the U.S. Finding the win at the top of the world in Colorado takes just the right combination of elements, with a wide spread of entries taking up the challenge. This year, more than 50 individual racers will sprint to the peak, with both domestic and international representatives in attendance. But one of the most fascinating things about the PPIHC is the surprisingly diverse mixture of cars, which includes modern hybrid sports cars, all-electric spaceships, purpose-built track cars, and modified street cars. There’s even a freightliner, and believe it or not, it’s quick. As such, we’ve outlined five cars to keep an eye on at Pikes Peak this year.