Idaho Historic Sites and Landmarks

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City of Rocks
Almo, ID, USA

A popular stopping point on the California Trail named for its strange resemblance to a city skyline scattered across Graham and Circle Creeks and their basins and rising against a backdrop of wooded mountainsides, this complex provided westbound emigrants a refreshing contrast to the extensive sagebrush plains surrounding it. Thousands of emigrants camped here, leaving still-visible wagon rut tracks. The site is now a State park and a National Reserve.

Weippe Prairie
Weippe, ID, USA

On the morning of September 20, 1805, an advance party of the Lewis and Clark Expedition came out of the Bitterroot Mountains onto the southeastern corner of Weippe Prairie, the western terminus of the Lolo Trail and long a favored source of camas root for the Nez Perce Indians. Here, the expedition first encountered the Nez Perce, who had never before seen white men. The Nez Perce gave the explorers food as well as much-needed help and directions during the 2-1/2 week period spent in their terr

Assay Office
Boise, ID, USA

Built by the Federal Government in 1870-71, the Boise Assay Office illustrates the importance of mining in the political, social, economic, and legal development of Idaho and the Far West. In operation from 1872 to 1933, it is one of the most significant public buildings remaining from Idaho's territorial days.

Experimental Breeder Reactor No. 1
Arco, ID, USA

On December 20, 1951, the EBR-I produced the first usable amounts of electricity created by nuclear means; in July 1963, it was the first reactor to achieve a self-sustaining chain reaction using plutonium instead of uranium as the major component in the fuel. In addition, the EBR-I was the first reactor to demonstrate the feasibility of using liquid metal at high temperatures as a reactor coolant.

Cataldo Mission
Cataldo, ID, USA

The oldest extant mission church in the Pacific Northwest, Cataldo was used by Jesuit missionaries (1850 or 1853) in their efforts to convert the Coeur d'Alene Indians.