[montag813]

I visited 2 Roman baths in Köln in the late 1980s that no one even knew about until the Allied bombs exposed them in 1945.

[Does so]

“...unknown ntil the Allied bombs exposed them in 1945.”

In 1961, I visited the cathedral. Its spires are visible from far away. Noted back then, large missing chunks from WWII battle were obvious from street level.