structural:reformatting, stylistic:tone, information:highlighting, quality:correction
20th century

The end of the 19th and the early 20th century saw the beginning of restoration efforts at the palace, first led by Pierre de Nolhac, poet and scholar and the first conservator, who began his work in 1892. The conservation and restoration were interrupted by two world wars but have continued until the present day.

The palace returned to the world stage in June 1919, when, after six months of negotiations, the Treaty of Versailles, formally ending the First World War, was signed in the Hall of Mirrors. Between 1925 and 1928, the American philanthropist and multi-millionaire John D. Rockefeller, Jr. gave $2,166,000, the equivalent of about thirty million dollars today, to restore and refurbish the palace.

More work took place after World War II, with the restoration of the Royal Opera of Versailles. The theatre was reopened in 1957, in the presence of Queen Elizabeth II of the United Kingdom.

In 1978, parts of the palace were heavily damaged in a bombing committed by Breton terrorists.

Starting in the 1950s, when the museum of Versailles was under the directorship of Gérald van der Kemp, the objective was to restore the palace to its state – or as close to it as possible – in 1789 when the royal family left the palace. Among the early projects was the repair of the roof over the Hall of Mirrors; the publicity campaign brought international attention to the plight of post-war Versailles and garnered much foreign money including a grant from the Rockefeller Foundation.

One of the more costly endeavours for the museum and the French Fifth Republic has been to repurchase as much of the original furnishings as possible. Consequently, because furniture with a royal provenance – and especially furniture that was made for Versailles – is a highly sought-after commodity on the international market, the museum has spent considerable funds on retrieving much of the palace's original furnishings.