Hekla — Gateway to Hell

For medieval Europe, Hekla wasn't just an Icelandic volcano — it was a documented mouth of Hell, with eruptions read as the screams of the damned.

Mount Hekla, a stratovolcano in south Iceland that has erupted more than twenty times since the island was settled, earned a reputation across medieval Europe that had nothing to do with geology and everything to do with theology. Iceland's isolation meant that reports of Hekla's eruptions reached the European mainland stripped of context and heavily embellished by the retelling. Twelfth-century clerical writers, working from these secondhand accounts, concluded that Hekla was a physical entrance to Hell — the mountain's smoke, fire, and violent noise interpreted as direct evidence of the underworld venting into the visible world. The Cistercian monk Herbert of Clairvaux wrote of Hekla in the 1180s as the eternal prison of Judas Iscariot; the chronicler Caesarius of Heisterbach repeated and expanded the association a generation later. The belief persisted with remarkable durability. Well into the sixteenth century, maps of the North Atlantic labelled Hekla as a gateway to Hell, and sailors reported — in testimony taken seriously at the time — hearing the screams of tormented souls carried on the wind from its slopes during eruptions, along with sightings of black birds believed to be damned spirits circling the crater. Icelanders themselves held related but distinct beliefs: that Hekla's fires were populated not by Christian sinners but by trolls, outlaws, and the drowned, and that approaching the mountain too closely was to risk being drawn into its underworld permanently. Hekla remains active. Volcanologists monitor it closely, on the entirely secular grounds that it is overdue.