The Iowa State University campus contains over 160 buildings, several of which are listed on the National Register of Historic Places. Iowa State University's campus, specifically its Central Campus, has been recognized as one of the nation's most beautiful and was listed as a "medallion site" by the American Society of Landscape Architects in 1999. Campus Iowa State's main campus features 490 acres of trees, plants and classically designed buildings. The concept of an open central campus encircled by buildings, was the vision of Iowa State's first president, Adonijah Welch. The campus is dominated by a large 20 acre central lawn known as Central Campus. Along with the University of Virginia and Yale University, ISU's central campus was listed as a "medallion site" by the American Society of Landscape Architects in 1999. It was listed as one of 25 most beautiful sites in the United States in the book The Campus as a Work of Art. Fountain of Four Seasons The fountain was sculpted by Christian Petersen in 1941 after a request from Iowa State President Charles Friley. The previous fountain was a vertical water tower on which students would place toilet seats. President Friley hoped that with a new, beautiful fountain, students would no longer make jokes of it. Lake LaVerne Named for Dr. LaVerne W. Noyes, who also donated the funds to see that Alumni Hall could be completed after sitting unfinished and unused from 1905 to 1907. Dr. Noyes is an 1872 alumnus. Lake LaVerne is located west of the Memorial Union and south of Alumni Hall, Carver Hall, and Music Hall. The lake was a gift from Dr. Noyes in 1916. Lake LaVerne is the home of two mute swans named Sir Lancelot and Elaine, donated to Iowa State by VEISHEA 1935. In 1944, 1970, and 1971 cygnets (baby swans) made their home on Lake LaVerne. Previously Sir Lancelot and Elaine were trumpeter swans but were too aggressive and in 1999 were replaced with two mute swans. In early 2002 Sir Lancelot suffered a broken foot from chasing a campus lawnmower. Sir Lancelot underwent surgery at Iowa State's College of Veterinary Medicine, but after months of physical therapy efforts in returning him to Lake LaVerne were unsuccessful. Early spring 2003 Lake LaVerne welcomed is new and current mute swan duo. However, in support of DNR efforts to re-establish the trumpeter swans in Iowa, university officials avoided