Many of the War Relocation Authority Camps where people of Japanese ancestry were sent during WWII are now National Historic Landmarks, Monuments, or Sites that can be visited.
They are listed below in alphabetical order by state with links to their websites. Some do not have visitor centers or much of a web presence yet. The best source for general information about Gila River and Poston in Arizona and Jerome in Arkansas is the National Park Service’s “Confinement and Ethnicity: An Overview of WWII Japanese American Relocation Sites.”
For information about the various other types of WWII assembly, detention, internment, isolation camps or prisons, see “Sites of Incarceration” in the Densho Encyclopedia.
Granada (Camp Amache)
Minidoka (National Historic Site)