Faeries, Aliens
Tales of Otherworlds are almost universal in folklore and myth. There is not space to recount all of them, but today there has been a renewed interest in tales from the British Isles and Scandinavia, specifically those related to faeries, elves and other such Otherworldly creatures.
An interesting question to consider is whether these ancient tales were perhaps references to what modern philosophers and quantum physicists now call multidimensions, parallel worlds or possible worlds. These are all terms for the theory that reality is made of many dimensions, not all of them conforming to the same laws, especially in terms of time.
Faerie stories from the British Isles are of particular interest here, because they often specifically refer to the distortion of time that occurs when mortals interact with denizens of faerie. One of the most popular stories, from Ireland, is that of Oisin, a young man who falls in love with a faery woman, Niamh, and follows her to Tir Na Nog, the Land of Eternal Youth. Tir Na Nog is a fascinating topic of its own, as it is a place where time as we know it does not exist. Oisin, of course, is mortal, but has the choice of remaining in Tir Na Nog where he would become immune to the passage of time. As often occurs in such tales, he makes the mistake of returning to his native land, where he finds that hundreds of years have passed and everyone he knew are long dead.
Stories from other lands have similar themes. The Welsh version of Tir Na Nog is Annwn, which is featured in the Mabinogion collection of stories. The Norse have Valhalla, though this is less a parallel world and more like the Christian heaven, as it is a place where mortals go after dying a