Yesterday I went to Central Park to see Christo and Jeanne-Claude's The Gates.
While each individual "gate" is nothing impressive, the overall work is quite stunning for two reasons: one is just the shear scope of it—7500 gates along tens of kilometres of paths; the whole being greater than the sum of its parts. The second thing that struck me was the number of people that had come to see it. There was a certain buzz in just walking along the paths with all the other people.
A lot more (bigger) photos that I took are here.