Lost during 1850s

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Calaveritas (Calaveras County, California)
Fort Jones (site) (Siskiyou County, California)
Fort Nez Perce-Old Fort Walla Walla (Walla Walla County, Washington)
Fur trading post established in 1818 abandoned in 1850
Fort Winnebago (Columbia County, Wisconsin)
One of three fortifications built by the army in Wisconsin along the river waterways.
Lassen Emigrant Trail (Lassen County, California)
Lassen Emigrant Trail, Bieber (Lassen County, California)
St. Peter's College (Rensselaer County, New York)
5 story brick building destroyed by landslide during construction in 1859