RECOMMENDED: 50 best New York attractions
This park is named after neither the Union of the Civil War nor the labor rallies that once took place here, but simply for the union of Broadway and Bowery Lane (now Fourth Avenue). Even so, it does have its radical roots: From the 1920s until the early ’60s, it was a favorite spot for tub-thumping political oratory. Following 9/11, the park became a focal point for the city’s outpouring of grief. These days you'll find the lively Greenmarket in warmer months, holiday shops in the winter and a summer concert series for kids.