Every year since 1962, dyeing the Chicago River green has been a local St. Patrick's day ritual. Nowadays, both the dyeing and a big parade take place the Saturday before the 17th. (Next year, they'll coincide when the 17th falls on a Saturday.) It's a uniquely Chicago tradition that tips its hat to the central role the Irish have played in the city's history. The actual dye is orange. It turns green as it's churned into the water.
For a few hours every year, the architectural landmarks that line the Chicago River acquire an aquatic front yard that's as vibrant as the neon green relish of a genuine Chicago hot dog. Read all about it and see all the pictures here.