National Gallery of Art two months after excavation had begun. At the time of its inception it was the largest marble structure in the world. The museum stands on the former site of the Baltimore and Potomac Railroad station, where in 1881 a disgruntled office seeker, Charles Guiteau, shot President James Garfield (see James A. Garfield assassination). As anticipated by Mellon, the creation of the National Gallery encouraged the donation of other substantial art collections by a number of private donors. Founding benefactors included such individuals as Paul Mellon, Samuel H. Kress, Rush H. Kress, Ailsa Mellon Bruce, Chester Dale, Joseph Widener, Lessing J.
Charles J. Guiteau storage by the museum. Parts of Guiteau's brain remain on display in a jar at the Mütter Museum in Philadelphia. Dr. Allan McLane Hamilton said in 1881 that he believed that Guiteau was sane when he assassinated Garfield. An autopsy of Guiteau's brain revealed that his dura mater was abnormally thick, suggesting he may have had neurosyphillis, a disease which causes mental instability; he could have contracted the disease from a prostitute. George Paulson, formerly the chair of neurology at Ohio State University, disputed the neurosyphillis diagnosis, arguing that Guiteau suffered from both schizophrenia and "grandiose narcissism". In 2014, the