An Hour in Chelsea

1. Richard Serra: Rolled and Forged

At Gagosian Gallery Through August 11

Five new steel sculptures.

2. Michael Heizer

At PaceWildenstein Through September 23

Eight large-scale stone sculptures, exhibited together for the first time in the United States.

3. A. R. Penck

At Leo Koenig Through August 5

Major paintings from the sixties to the eighties by the German artist.

An Hour in Chelsea