The more I think about it, it may have been Dachau. Grandpa only talked about it once, and, blessed as I was with the know-it-all wisdom of an 18-year-old, I didn't pay close attention. I just assumed that there would be plenty of other opportunities.
It doesn't matter which, I suppose. The point would be the same.
He said one thing that stuck with me - after visiting the camps, he "knew exactly why he was over there".
And, I suppose, this bit is relevant to the thread. A fair bit of his (my) family was from Dresden, originally. Those who could, emigrated to America before the Kaiser started to get frisky.
Grandpa, while he was over in Germany right after WWII ended, tried to see if there was anything he could do to help the family who stayed. He said that there was nothing to be done; they either were all dead, or all gone, with no trace left either way. "Everything had been burned flat", was what he said, approximately.
I also remember him saying that 100,000+ were killed, not the 20-25K quoted in the article. I'd believe someone who was there to see it, I think.
There was a Band of Brothers episode that dealt with the 101 encountering such a camp, the episode was titled "Why We Fight".