The Lincoln Memorial in Washington DC is open again after green paint splattered across the monument, was removed.
Paint was found all over the seated statue of the 16th US president and on the floor early on Friday morning.
Lincoln, who was president from 1861 until his assassination in 1865, led the northern states to victory against the South in the American Civil War.
The BBC reports the memorial chamber was closed all day on Friday to allow a National Park Service crew to finish cleaning up the paint.
Pressurised hoses and a chemical paint remover were used to wash away the paint.
The monument is normally accessible 24 hours a day. It is unguarded overnight.