Gilgamesh
One of the earliest stories known, Gilgamesh is putatively SF with supernatural elements and wild impossibilities -- one of the key requirements of a good SF story is engaging the reader's Willing Suspension Of Disbelief (WSOD) and anything that noticeably distorts reality needs some serious WSOD for the reader to stay engaged with the story.
As for adventures, the definition "Bad things happening to people I don't personally know a long way from where I'm sitting comfortably reading about them" springs to mind.