{"nrhp_refnum":"09000849","name":"ASM Headquarters and Geodesic Dome","other_names":["Materials Park"],"category":"building","location":{"address":"9639 Kinsman Rd.","address_restricted":false,"city":"Materials Park","county":"Geauga County","state":"OH","lat":41.46130057150006,"lon":-81.29888649850943,"geom_source":"nps_gis"},"listed_date":"2009-10-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"Headquarters building of ASM International and an adjoining R. Buckminster Fuller geodesic dome at Materials Park, off Ohio Route 87 in Geauga County, Ohio, both built in 1959 on a roughly forty-five-acre estate.","why_significant":"The nomination presents the semi-circular, glass-walled headquarters, designed by architect John Terence Kelly, as a prominent example of Modern architecture with extensive and varied use of metals. The dome, called the world's largest open-work geodesic dome, is treated as an innovative engineering and design feature. The two structures are structurally independent but form one architectural concept.","narrative":"Materials Park, about twenty miles east of Cleveland, holds the headquarters of ASM International and a large geodesic dome designed by R. Buckminster Fuller. Both were completed in 1959. The three-story, semi-circular office building by architect John Terence Kelly covers 50,000 square feet and is wrapped in glass curtain walls, with reinforced concrete floors and extensive use of steel, aluminum, bronze, copper, titanium and tungsten. A stainless steel sun shield 13 feet high and 390 feet wide covers the western face. The aluminum dome rises 103 feet, spans 274 feet and rests on five pylons, two of which pass through courtyards in the building. It shelters a sunken Mineral Garden displaying ore specimens. The building and dome are structurally separate but were conceived as a single design. The property is recognized for its Modern architecture, its inventive use of metals and its engineering, and it remains in use as the society's headquarters.","period_of_significance":null,"architect_builder":"Architect John Terence Kelly (headquarters); R. Buckminster Fuller (dome design); Gillmore-Olson Co., general contractor; Mak Construction Co., erector; North American Aviation Corp's Columbus Division, fabricator; Kaiser Aluminum & Chemical Co., aluminum supplier","architectural_style":"Modern Movement","criteria":[],"status_note":"Headquarters remains in use as ASM's offices; the first floor of the north section serves as its reference library. Metal solar shades were added around 1974-1975.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:52:06.895465-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/09000849.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/09000849/0c43e08d72-800.webp","url_1600":"https://nationalhistoricalregister.com/media/09000849/0c43e08d72-1600.webp","licence":"CC BY 2.0","author":"Ohio Urban Development","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Russell_Township-ASM_Headquarters_%26_Geodesic_Dome_(OHPTC)_(5912348229).jpg\" rel=\"noopener\">Ohio Urban Development</a>, <a href=\"https://creativecommons.org/licenses/by/2.0\" rel=\"license noopener\">CC BY 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Russell_Township-ASM_Headquarters_%26_Geodesic_Dome_(OHPTC)_(5912348229).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71988672","wikipedia":"https://en.wikipedia.org/wiki/ASM_Headquarters_and_Geodesic_Dome","wikidata":"https://www.wikidata.org/wiki/Q4654294"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/geauga-county/asm-headquarters-and-geodesic-dome-09000849/"}