Riverside Park 91st Street Garden

For 26 years, a volunteer collective called the Garden People has carefully curated the block-long 91st Street Garden, the most colorful corner of Riverside Park. (It's also one of the most famous locations, having made a cameo in the romantic climax of the 1998 film You've Got Mail.) During the summer, keep an eye out for hundreds of varieties of flowers, blooming rose of Sharon treets, giant hibiscus flowers and monarch and swallowail butterflies, which emerge in the evenings and are drawn to the aromatic bushes.