Abraham Lincoln is also the only US president to have a memorial in Scotland- indeed, the first in Europe. It was built in 1893 to honor Scots who fought for the Union during the American Civil War. The memorial shows a slave being freed at Lincoln's feet, and it was mostly paid for by John D Rockefeller and Andrew Carnegie. Six sons of Edinburgh signed up to fight on Lincoln’s behalf - Sergeant Major John McEwan; Lt Col William Duff; Robert Steedman; James Wilkie; Alexander Smith and Robert Ferguson. Their names are inscribed on the memorial, which depicts a slave being released from shackles at the feet of Lincoln.