The 18-ton statue of Lord Nelson that stands atop the huge granite column in London’s Trafalgar Square has been through a lot over the years. “When Edward Baily’s statue was displayed at ground level before being winched into place in three enormous sections it was a sensation: more than 100,000 people came to see it.” But now, the elements have had more than 150 years to wear on Baily’s design, and a major conservation effort is underway.