The Museum of the City of New York is paying tribute to the New York City street grid (where would we be without it?), with a retrospective examining its 200 year history. The Greatest Grid is now open and will run through April 15th, and features an original hand-drawn map of New York's planned streets and avenues, which as you know by now was prepared by the Commission in 1811. You'll also see "rare historic maps, photographs and prints of the evolution of the city's streets, and original manuscripts and publications that document the city’s physical growth, the exhibition examines the grid’s initial design, implementation, and evolution." Here's a peek at the exhibit—check out what 2nd Avenue and 42nd Street looked like back in 1861!