Address Restricted, Portland, Missouri. County/parish: Callaway.
Added to the National Register of Historic Places October 15, 1966. NRIS 66000415.
1 contributing site.
Research Cave, also known as the Arnold Research Cave and the Saltpetre Cave, and designated by the Smithsonian trinomial 23CY64, is a major Native American archaeological site near Portland, Missouri. Investigation of the site has uncovered evidence of human habitation as far back as 8,000 years. The site was designated a National Historic Landmark in 1964; it has been recommended for de-designation due to looting.
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