<Li> Nathaniel Hawthorne's 1837 short story, "Dr. Heidegger's Experiment," features as a key element a bottle of water drawn from the fountain . </Li> <Li> Tyrannus in Marvel Comics became immortal from drinking from the Fountain of Youth in Subterranea . </Li> <Li> A different Fountain of Youth in Marvel Comics, in the Everglades, was found in Steve Gerber's Man - Thing comics . The waters of this Fountain of Youth had a positive effect for those bathing in it; its earliest discoverers, however, were made immune to death from natural causes, but became very frail and easily killed . Those who survived to appear again in The Savage She - Hulk were referred to as purple swamp demons, and the artwork exaggerated their previous appearance toward this view . The Fountain of Youth was found in a hidden village called La Hacienda, whose people remained young through repeated bathing in the Fountain . </Li> <Li> A third Marvel Fountain of Youth is found in the animated serial, Bigfoot and the Muscle Machines . Its waters could be drunk, but their effect was temporary . It was destroyed . </Li>

When did the fountain of youth come about