Living in the city can be great. I know because I live in one. But sometimes the concrete, the crowds, the pollution, and the inability to walk around barefoot still get to me. There's something about being in nature (or at least near a tree and some grass) that relaxes you. When you're stressed from the bustle or worn down from looking at gray all the time, there's nothing like stillness and chlorophyll to block out everything else. City planners knew this, and that's why cities have parks. Here's a look at some of the 24 best urban parks in...