‘…Though names may differ from one set of teachings to another, almost every religion on the planet features the concept of an underworld—a place to which the souls of the dead are banished, for penance or punishment. So in honor of 31 Days of Halloween, we mined the Atlas for the various purported entrances to the netherworld, scattered across the globe, ranging from Mayan caves to Japanese swamps. But remember: If you should decide to visit any of these sites, it should be noted by way of a disclaimer that we take no responsibility whatsoever for the consequences of your attempts to open an infernal portal…’

Source: Atlas Obscura