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At Dia, Richard Serra and Robert Irwin make art you can enter; a forgotten French sculptor enlivens the Met.

At the Whitney Museum, where a face-lift once was contemplated, more modest changes shed new light on art.

Two shows at the Met capture a turning point in twentieth-century art: the moment when photography became modern.

At MoMA, two painters from opposite ends of the century, Fernand Léger and Chuck Close, and their meditations on the mechanical.

The Guggenheim's massive exhibition of Chinese art flatters the reigning powers of East and West -- by ironing out the rough spots.

Long taken for granted, always out of step with the times, the painter Arthur Dove gets his due with a Whitney retrospective.