The campus grew to its present size of through gradual acquisitions of adjacent private lands, and remains the university's largest landholding. In addition to its main campus in Kingston, Queen's owns several other properties around Kingston, as well as in Central Frontenac Township, Ontario; Rideau Lakes, Ontario; and East Sussex, England. Queen's University is situated on traditional Anishinaabe and Haudenosaunee territory. The buildings at Queen's vary in age from Summerhill, which opened in 1839, to Mitchell Hall, which opened in 2018. Grant Hall, completed in 1905, is considered the university's most recognizable landmark. It is named after Reverend George Munro Grant, who served as Queen's seventh principal. The building is used to host concerts, lectures, meetings, exams, and convocations. Two buildings owned and managed by the university have been listed as National Historic Sites of Canada. The Kingston General Hospital is the oldest operating public hospital in Canada. The Roselawn House, which is east of the west campus, is the core component of the university's Donald Gordon Centre. Queen's University Libraries include six campus libraries and an archives in six facilities housing 2.2 million physical items and 400,000 electronic resources, including e-books, serial titles and databases. The library's budget in 2007–2008 was $18.1 million, with $9.8 million dedicated to acquisitions. The libraries are Bracken Health Sciences Library, Education Library, Lederman Law Library, Stauffer Humanities and Social Sciences Library, and Engineering & Science Library. The W.D. Jordan Rare Books and Special Collections Library notably harbors early-dated books from 1475 to 1700. The Engineering & Science Library and the W.D. Jordan Rare Books and Special Collections Library share facilities, known as Douglas Library. Since 1981, the Queen's University archives has been housed in Kathleen Ryan Hall. The archive manages, preserves, conserves, and makes accessible the information assets and historical record of the university. In addition to the university's archive, Kathleen Ryan Hall also houses the City of Kingston's archives. Queen's operates the Miller Museum of Geology, an earth-science teaching museum which features an Earth Science and Geological Collections of 10,000 minerals and 865 fossils, as well as an exhibit of the geology of the Kingston area. The museum is largely used as an earth-science teaching museum for local schools and natural-science interest groups in eastern Ontario. The permanent exhibits feature dinosaurs, dinosaur eggs, fossils of early multi-celled animals, and land tracks fossilized from 500 million years ago.