hell gate
/ˈhɛl ɡeɪt/noun
The portal or entrance of hell, especially regarded as an embodiment or symbol of evil or vice. Frequently without article, as a proper name.
Origin
Old English. From hell + gate. Compare Old Frisian hilleporte, Old Saxon helliporta (Middle Low German hellepōrte), Old High German helliphorta (Middle High German helleporte, hellephorte, German Höllenpforte); compare also Old Icelandic helgrindr.