Over the past decade or so, Littleton, Mass., masonry contractor Mike DeBlasio has completed a number of challenging projects for Boston’s Museum of Fine Arts. But late last year, the MFA handed DeBlasio and a hand-picked team of specialty subcontractors a truly monumental challenge: helping museum conservators move a recently purchased 1,900-year-old marble figure of Juno from a private estate in Brookline, Mass., to the museum, a five-mile trip by road.

At 13 feet 8 inches, Juno (wife of the Roman god Jupiter) was the largest classical sculpture in the U.S. But the harsh New England climate had not been kind to her. Since being imported from Rome in 1904 by a wealthy Boston couple, her surface had been etched by acid rain and streaked with green moss. Worse, a century of freeze-thaw cycles had...

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