On the inside, the rotunda is a soaring space with a grand marble stairway rising up to the second floor, where ten fluted Corinthian columns support the coffered dome, which was added in a 1912 restoration by Grosvenor Atterbury. The rotunda has been the site of municipal as well as national events. Abraham Lincoln's coffin was placed on the staircase landing across the rotunda when he lay in state in 1865 after his assassination. Ulysses S. Grant also lay in state beneath the soaring rotunda dome – as did Colonel Elmer Ephraim Ellsworth, first Union officer killed in the Civil War and commander of the 11th New York Volunteer Infantry Regiment (First Fire Zouaves).