Idaho Historic Sites and Landmarks

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Sacred Heart MissionSacred Heart Mission
Cataldo, Idaho, USA

Built in 1853, this Jesuit mission in northern Idaho is the oldest existing mission in the Pacific Northwest.

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.

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.

Fort Hall

Fort Hall is the most important trading post in the Snake River Valley and is known for its important association with overland migration on the Oregon-California Trails. In the 1860s and 1870s it was a key road junction for the overland stage, mail and freight lines to the towns and camps of themining frontier in the Pacific Northwest.