If you're fortunate enough to be in Grenoble sometime before 9 June 2013, then run, don't walk to the Giacometti exhibition at the main museum in town.
Alberto Giacometti is one of the 20th century's outstanding sculptors, with a spare style that stripped people down to their most elemental. It was said about him that if he sculpted you, soon there would be nothing left. That's quite obvious in this collection, which focuses on the theme of the 'cage' in which the sculptor has placed most of his subjects or models.
I was mesmerized by his ability to recreate a human face or body out of so few elements. His aim was to reflect people's desire to reinvent or redesign themselves after the wreckage of World War II, although he did so abstractly.
And if you happen to visit at lunchtime (though not on a Sunday, it's too crowded) eat at Le 5, the museum's restaurant. You might want to try their giant profiterolle, halfway between a soccer ball and a puff pastry. Just walk in and reserve a table before you see the exhibit.