No, Poseidon was a mythological character. Greek myths like those involving Poseidon were ways for people to imagine and understand things they couldn't explain through ordinary means. They weren't real historical accounts.
Athena is not a real story. She exists within the realm of mythology, which often uses symbolic and imaginative elements to convey cultural and moral values, not to recount factual events.
Well, the Atlantis story is considered more of a legend. Despite many theories and searches, no conclusive proof has emerged to confirm it as a real place. It might have been inspired by real events but exaggerated over time.
The Dogman is often considered a legend or a myth. There's no scientific evidence to prove its existence as a real creature. It's likely a part of folklore and urban legends that have been passed down and exaggerated over time.