If you're in the US, in particularly Northern California between now and January 13th you might enjoy Ansel Adam's Master Works exhibit at the Turtle Bay Museum in Redding California.
Ansel Adams: Masterworks
I was there today and they have most of the classics such as Moonrise Over Hernandez, Tetons Snake River Bend, Passing Storm, etc etc plus a few of Ansel's portraits and environmental pictures too. A very nice selection.
Certainly the best $9 I've spent in a long while!