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The move could see bars open later and more al fresco dining in London and, if successful, could be extended to other parts of the country such as Greater Manchester or the West Midlands.

This rendered them in pristine condition but also made them quite fragile, which is why after uncovering several 6-inch spots and confirming that the frescoes were intact, Graves immediately covered up the art again.

Surrounded by red columns and frescoes of athletes, a visitor could cool off in the plunge pool, which is so large 20-30 people could fit in it.

The most fascinating is the complex compositional analysis of the figures in Leonardo’s second most famous painting, “The Last Supper,” that vast fresco in a communal dining room of a Dominican convent in Milan.

Earlier this year, archaeologists revealed frescos of mythical Greek figures including Helen of Troy and Apollo.