Interesting article, but the pictures aren't loading for me.
If anyone is wondering, it's not a complete list - it's about a few of the more unique or interesting spots to have one. Wikipedia has a list.
I was wondering what happened to the ones at the original Newseum in Arlington, VA. The Newseum moved to DC and then closed a few years ago. It looks like they moved the Wall segments with the museum, but it doesn't say what happened to them when the museum closed.
On a more personal note, when we visited Berlin in 2016, we bought a mug that has various sights in Berlin on it... "Mauer" is there, but it's crossed out.