{"nrhp_refnum":"80003578","name":"Grey Towers","other_names":["William Welsh Harrison House","Beaver College"],"category":"building","location":{"address":"Easton Rd. and Limekiln Pike","address_restricted":false,"city":"Glenside","county":"Montgomery County","state":"PA","lat":40.09040880900005,"lon":-75.16447885828052,"geom_source":"nps_gis"},"listed_date":"1980-02-14","is_nhl":true,"nhl_designated_date":"1985-02-04","areas_of_significance":["Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"Grey Towers is a 41-room, three-story castle-style mansion built of grey Chestnut Hill stone with six towers, in Glenside, Montgomery County, Pennsylvania. It was designed in 1893 for William Welsh Harrison and now serves as part of the campus of Beaver College.","why_significant":"The nomination argues that Grey Towers is a landmark in the career of architect Horace Trumbauer and an outstanding American example of a castle in the eclectic style. It is also presented as an expression of the social aspirations of wealthy late nineteenth-century families, and its interiors feature fine handcarved woodwork, French Renaissance detailing and tapestries.","narrative":"Built of grey Chestnut Hill stone with six towers and crenellated walls, Grey Towers is a castle-style mansion in Glenside, Montgomery County, Pennsylvania, designed by Horace Trumbauer in 1893 for William Welsh Harrison, a partner in the sugar refining firm Harrison, Havemeyer and Company. The building has 41 rooms over three stories and draws on 12th century Alnwick Castle in England. Its main hall rises three stories to a coffered, barrel-vaulted ceiling inspired by French Renaissance design, and its interior woodwork is handcarved mahogany. Tapestries by the Baumgarten firm hang in several rooms, and the library carries the carved date 1897. The property is significant because it is regarded as an outstanding American castle and because it marks the start of Trumbauer's career with large residences. In 1929 Beaver College bought the estate, and it has served as the college's campus since 1962.","period_of_significance":"1800-1899","architect_builder":"Horace Trumbauer (architect)","architectural_style":"Eclectic; medieval English castle with French Renaissance interior elements","criteria":["B","C"],"status_note":"Altered for use as a college campus; the solarium and greenhouses have been demolished and the interior rooms have been adapted for offices and dormitories.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:30.853176-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/80003578.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/80003578/c456f905ec-800.webp","url_1600":"https://nationalhistoricalregister.com/media/80003578/c456f905ec-1600.webp","licence":"Public domain","author":"Unknown authorUnknown author","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Grey_Towers,_450_South_Easton_Road,_Beaver_College,_Glenside_(Montgomery_County,_Pennsylvania).jpg\" rel=\"noopener\">Unknown authorUnknown author</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Grey_Towers,_450_South_Easton_Road,_Beaver_College,_Glenside_(Montgomery_County,_Pennsylvania).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71995685","wikipedia":"https://en.wikipedia.org/wiki/Grey_Towers_Castle","wikidata":"https://www.wikidata.org/wiki/Q5608256"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/montgomery-county/grey-towers-80003578/"}