@WaterHopper: Mary Todd Lincoln held several séances at the White House after the death of her son Willie in 1862. She was trying to communicate with him. President Lincoln attended many of the séances held there. They were held in the “Red Room” of the White House.
Nettie Maynard was a medium that Mrs. Lincoln often used. It is rumored that on one occasion, Nettie was playing the grand piano in the White House when it levitated off the floor. President Lincoln and Colonel Simon Kase climbed onto the piano that was jumping and shaking so hard that they quickly climbed down.
It is also said that Mary saw many ghost in the White House, including Andrew Jackson, Thomas Jefferson and John Tyler.