World War II Heritage Sites
Where History Was Made - And Still Lives
During World War II, the Tri-Cities region underwent one of the most dramatic transformations in American history. What was once a collection of rural communities became the heart of a top-secret mission, the Manhattan Project, with the construction of the Hanford Site and the rapid development of Richland, Pasco, and Kennewick. Entire towns were displaced, neighborhoods rose overnight, and people from across the country arrived to support a war effort cloaked in secrecy.
Today, you can still see, feel, and walk through this history.
In recognition of its vital role in the war and its efforts to preserve that legacy, the Tri-Cities has been designated an American World War II Heritage City by the National Park Service. This honor reflects the people, places, and stories that defined a generation — and continue to shape the community.
Explore the hidden stories, lasting landmarks, and living legacy of the Manhattan Project and World War II through five distinct themes that bring this chapter of Tri-Cities history to life.