My son (16) and I are going on this (amazing!) trip together so I may be a bit difficult to reach for the next week or so, apologies https://www.sojournproject.org
Experience history. Inspire the future. | Sojourn Project

Sojourn to the Past
Little Rock Nine - Wikipedia

16th Street Baptist Church bombing - Wikipedia

I wondered why the history of civil rights was so especially brutal in Birmingham, AL, versus other southern cities (historians consider it the most brutal). Then I learned it was a company town. Now go look up why healthcare is so historically screwed up in the USA. We should be teaching the root causes first.
The Dahmer family got the most vicious branch of the KKK in the entire United States taken down after 30 years. His wife (age 99) and two of his sons spoke with us about it all. https://en.m.wikipedia.org/wiki/Vernon_Dahmer
Vernon Dahmer - Wikipedia

I apologize if I have been a bit cranky lately but this Sojourn tour, while incredible, is also kind a lot of contextual murdering to process.
@codinghorror
For me it was visiting the National Museum of African American History and Culture on the Mall. I had to leave before seeing it all. It was too overwhelming for me to see all that awful history in one place.
The Legacy Museum

Explore the history and legacy of slavery in America.

Legacy Sites