- Ireland's "Hell Caves," where Halloween was born
- The Gates of Hell crater in Turkmenistan, burning for more than 50 years
- Hell, Michigan, where you can serve as the mayor of Hell for a day
- Turkey's Pluto's Gate, an ancient Greco-Roman temple guarding a toxic cave
- China's Fengdu City of Ghosts, where tourists pre-game the afterlife in a town devoted to the underworld
- The Maya Cenotes throughout the Yucatan Peninsula, long considered portals to hell
- And so many more!