We went to a village named Oradour-sur-Glane in France, near Limoges, which is the site of a massacre by a company of Waffen SS soldiers in 1944.
642 men, women and children were murdered in reprisal for 3 or 4 Germans killed in a nearby village a few days before. The victims were mostly herded into the church, where they were machine gunned down and then set alight. the village was then destroyed. After the war, the village was turned into a Village Martyr by De Gaulle, and stands as a memorial to the dead as it was left, A new village, of the same name, was built next to the site.
A very eerie experience for us both, especially as we discovered that the day we went was the anniversary of the massacre, and we had just missed the memorial service. It didn't help that there were storm clouds in the area. with constant thunder all around.
2 years and 6 days later, my wife died about 50 miles away!
I would love to go and visit Auschwitz/Birkenau, but having seen the results of those atrocities on such a (relatively) small scale and been so affected by it, I'd be a gibbering wreck when I got there.