He immediately realised that it was a copy of the painting in his family collection.

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Inside the golden domed State House on Beacon Hill is an oil painting of Romney with a copy of a bill decorated in a medical symbol beside a portrait of his wife Ann.

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Experts at Amsterdam's Van Gogh Museum have long wondered whether an 1889 drawing entitled Wild Vegetation was a copy of a completed painting.

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Lascaux II is an exact copy, painstakingly re-created using the same painting techniques as in the originals: pigments mixed in the mouth and blown onto the walls through marrow bones.

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The painting, which resided in a church in Almeria for more than 120 years, was originally believed to be a copy.

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