The Solomon R. Guggenheim Museum, often referred to as The Guggenheim, is the permanent home of a renowned and continuously expanding collection of Impressionist, Post-Impressionist, early Modern and contemporary art and also features special exhibitions throughout the year. The museum's collection has grown organically, over eight decades, and is founded upon several important private collections, beginning with Solomon R. Guggenheim's original collection. The collection is shared with the museum's sister museums in Bilbao, Spain, and elsewhere.
Source: https://en.wikipedia.org/wiki/Solomon_R._Guggenheim_Museum