The Dia Foundation has a great museum up the river Hudson a-ways from New York City and it's well worth a visit. It specializes in artists from the 1960s onward, showing work that's high in concept and site specific. It's a primal experience.
One of the heavies, Richard Serra. His work seems like ship steel bent to his whim.
Art that sums up Dia's purpose, white on white (ode to Bob Dylan?) and a painting that depicts the day it was painted.
Dan Flavin, who worked in fluorescents. Impossible to photograph faithfully, which is probably part of the fun of seeing the art transformed as an image. Art that keeps evolving.
Surveillance footage of a loft studio and a pile of broken glass works as art.
Sarah, getting green.