Ghosts of WW2

[alaric99x]

That's not unusual, you'll see that kind of thing all over Europe. Many of the castles, churches and other structures were built over a period of many centuries. For example, there was a church in the town where I lived in Germany originally built in Romanesque style. When Gothic style became popular, they knocked holes in the walls and added some Gothic windows. Later they added a clock tower in Baroque style. If you visit the forum in Rome you'll see a Roman temple that was rebuilt into a christian church. In various other places Roman kastells became castles and, later still, Vauban style fortifications. You can still see parts of Roman walls at the Tower of London.

The Powder Tower at Prague was originally built about 1475, one of 13 towers in the wall around the city. About 200 years later it was remodelled in Gothic style. (I know Gothic actually became popular around 1450, so I have no idea why they didn't build it in that style in the first place, nor have I done any research on what the original style was.) Maybe the differences in the arches come from that modification, I don't know. Anyway, architectural styles that don't seem to match are not a reliable indicator that a structure isn't authentic.