America has invaded the gilded chambers and sculpted gardens of the Château de Versailles in the form of an exhibition by the American superstar artist Jeff Koons. Versailles in recent years has displayed only a few select works of contemporary artists. The exhibition of 17 Koons sculptures marks the first time that the chateau built by Louis XIV has organized so ambitious a retrospective of one contemporary artist. The exhibit, which opened on Wednesday, will continue until Dec. 14.