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My parents believe that Coliseum and Notre Dame weren't built by humans, so yeah pretty safe bet!

Who do they think built them?

Some kind of highly anthropomorphic non-human entity is highly popular throughout history.

ayylmaos?

Flavian Amphitheatre ("Colosseum"): Sasquatch Trolls.

Cathédrale Notre-Dame de Paris: A fragile temporary alliance of vampires and werewolves.

Obviously.