Every other Thursday night from around May to October, spectators have the chance to see some of the fastest cyclists in America at the Boulder Valley Velodrome's weekly race series. The velodrome, which opened in 2015, is designed specifically for speed; the 250-meter outdoor track has steep, banked turns, and cyclists use brakeless, fixed-gear bicycles with aerodynamic frames, allowing them to reach speeds of up to 50 miles per hour. Participants range from Olympians to local amateur racers, and the spectating is free. Feel like giving the track a go? Memberships (ranging from $185 to $500) and day passes ($30) are offered to cyclists of all levels.