The Kissena Velodrome, one of 29 or so velodromes in the country, hosted the 1964 US Olympic track cycling trials. By 2002, however, after years of neglect, it was in such poor condition that an article in Bicycling magazine declared it "the nation's worst cycling track". It was rededicated in 2004 after being renovated as part of NYC's failed bid for the 2012 Summer Olympics, but now, more than a decade later, it appears to have sprouted a nice array of cracks once again.
Rode here twice. The first time I was really chicken and rode the bottom flat level. The second time, I got the courage to try to ride on one of the higher slopes and nearly fell off my bike, but luckily sped up enough to make it to the top and grab onto the fence. That was it. Never again :)