Simmons added that he was also taken by the age of the Palace of Westminster, saying: "I will tell you, touching a piece of granite that's over 1,000 years old is insane.
"America is so young and has no sense of history, everything over there is just fast, immediate, instant gratification and there's no time to sit there and just gaze, I mean, look where you are - it's insane.
"We're standing on, in terms of democracy, hallowed ground."
Simmons, whose parents were Holocaust survivors who moved to Israel after the war, was raised in a traditional Jewish home and attended Yeshiva briefly in Brooklyn, New York.
The rock frontman was in the UK as part of a Kiss tour which is taking the band across the UK. Simmons has previously spoken out against musicians that boycott Israel saying in a 2011 interview that those who refused to perform in Israel for political reasons were “fools”.