IIRC, the streets around the location of the Fuhrerbunker have been realigned, so that the street address of, and the approach to, the Furherbunker and the building complex of which it was part no longer exist in any sense.
The bunker complex was extensive. Parts of it lay under what are now streets, parts under what are now buildings, and parts under what is now car park/open space. In theory you could identify the separate locations of each entrance to the bunker, of the room in which Hitler shot himself, of the spot on which his body was burned. In practice there is nothing on the site to enable you to orient yourself and identify these spots, and some of them are likely occupied by buildings. Even the information board (which was only erected about 10 years ago) is sited only at the approximate location of the bunker.
It is true that the streets immediately adjacent to the site of the Furherbunker do not follow the lines of any streets that were there during the Nazi period. But that’s because there were no streets there at all. The area bounded by the Wilhelmstraße, Voßstraße, Ebertstraße (later Hermann-Göring-Straße) and the Pariser Platz formed a single block. Most of the buildings on the Wilhelmstraße had gardens stretching all the way across to the Ebertstraße. The new Reich Chancellery complex did not change that street plan and did not create any new streets. The present-day Wilhelmstraße, Voßstraße, Ebertstraße and Pariser Platz more or less follow their original alignments, sometimes because a few earlier buildings survive. It is just that all the streets in between are more recent.
I visited Berlin a few years ago and one of the museums we visited (on the Museumsinsel) had an empty plinth and a sign saying “this is where one of our awesome museum exhibits used to be, but those nasty Russians stole it when they invaded and now they won’t give it back”. (I may be paraphrasing somewhat.)
Wouldn’t that be much more akin to having a memorial to all of the victims of the Confederacy, or turning a plantation into a memorial to the horrors of slavery? Its not like the Poles are honoring the Nazis.
This is specifically a Japanese thing (none of the other former Axis powers have anything like this). It is quite similar to the kind of glorification of the confederacy that the OP refers to IMO (though even Japan doesn’t literally have any statues of WW2 generals in any town square).
It is also completely reviled and considered unacceptable by all other countries including Japan’s allies (most especially countries that were occupied by Japan during WW2). As witnessed by the fact that even Justin Beiber (not I’m sure drilled in the finer points of post-war diplomatic niceties) visiting one was a big deal and he had to apologize.