Part of the artist’s Water Lilies series, worth $25m (£15m), was left to the Corcoran Gallery by Huguette Clark, who died last month aged 104. The painting has been out of public view for 86 years.
The Corcoran has a gallery which bears the name of her father Senator William A Clark, who died the same year the painting was created in 1925.
Ms Clark bequeathed a proportion of her $400m (£250m) fortune to the arts.
Graham Spicer is a writer, director and photographer in Milan, blogging (under the name ‘Gramilano’) about dance, opera, music and photography for people “who are a bit like me and like some of the things I like”. He was a regular columnist for Opera Now magazine and wrote for the BBC until transferring to Italy.
His scribblings have appeared in various publications from Woman’s Weekly to Gay Times, and he wrote the ‘Danza in Italia’ column for Dancing Times magazine.