Something else that makes Berlin interesting is the trio of flak tower complexes built during WW2.
One of them, located in what was then East Berlin, was demolished and the rubble covered over to form an artificial hill (known officially as Grosser Bunkerberg/Large Bunker Mountain and unofficially as Mont Klamott).
There was so much rubble from the main tower that the hill rises to 78m while the smaller tower provided enough rubble to create a hill of 48m.
Speculating idly, I wonder if there are any open spaces in the rubble? Something that could be burrowed into to create a hidey hole for someone attempting to survive in Berlin. One website claims that these demolished towers can indeed be visited... but you will have to do a lot of digging... in a public park... However that won't be any real barrier in the T2k world.
http://worldwartwo.filminspector.com...ld-war-ii.html
Nothing remains of the tower complex that was in Tiergarten (the site is now part of the Berlin Zoo).
The third complex still has portions of the structures intact. Intact and high enough to make good observation points. Some of the interior remains intact for one of the towers as well. Apparently this last section was left because it was feared demolition attempts would damage the nearby railway lines.
Links for the Berlin towers: -
http://www.battlefieldsww2.com/berlin-flaktowers.html
https://www.triphistoric.com/the-berlin-flak-tower-472/
https://www.landmarkscout.com/flak-t...erlin-germany/
Another, although you have to scroll down about two thirds of the page: -
http://www.thirdreichruins.com/berlin.htm
There's also this YouTube vid although it doesn't actually show the tower until the 2:55 mark. It doesn't show any of the interior but it does illustrate the field of view available from the top of the tower and gives a sense of scale when you see people standing next to it. It also shows some of the battle damage apparently sustained during the fight for Berlin.
https://www.youtube.com/watch?v=kzdDJG7rU1s
Here's the wiki link to their page on the flak towers in general.
https://en.wikipedia.org/wiki/Flak_tower
A link with a number of period photos, some showing the interior of the towers.
http://theelephantgate.weebly.com/th...o-the-zoo.html
These towers are generally forgotten in most histories of WW2.
There were more of them in cities controlled by Nazi Germany and many survive to this day, the effort and expense required to demolish them was deemed too much in some cases.
While this site does have the same general info as others I've linked to, it does have a useful map of the locations of the surviving towers: -
https://owlcation.com/humanities/Wor...efense-Castles
Most towers had walls 3.5m/11ft thick. They were massive & formidable fortifications that have been described by some as "anti-aircraft castles". Most of them could accommodate 10,000 people during air raids.
Anecdotal stories tell of the Soviets in Berlin eventually besieging the towers to starve out the defenders rather than attacking them because they had no ordnance that could penetrate the structures.
There is no doubt in my mind that the towers in Vienna and Hamburg (having survived largely intact) would be useful places in T2k... useful, or troublesome, depending on who controls them
Some other links: -
https://war-documentary.info/vienna-...wers-flakturm/
https://medium.com/war-is-boring/hit...s-4da8c423b725
http://www.kuriositas.com/2012/04/fl...luftwaffe.html
https://www.warhistoryonline.com/war...ak-towers.html
https://www.thevintagenews.com/2018/01/17/flak-towers/
https://timeline.com/hitlers-flak-to...t-b18b7627fe91