It's not unexplored per se, but the Ploutonion at Hierapolis emits toxic gas intense enough to kill most living things in moments, and was assumed to be a gate to the underworld. In a rather illuminating display of their culture, rather than avoiding the Cave of Painfully Slow Asphyxiation, the Romans turned it into a tourist attraction at which one could purchase a live animal to throw in or meet Oracles of Pluto who had been through into the cave and lived.
19 SERIOUS PLACES ON EARTH THAT ARE STILL UNEXPLORED BECAUSE LOCALS FEAR THEM AND Y AFRAID OF
26 AS A TEENAGE BOY IN MIDDLE OR HIGH SCHOOL WHAT CONFUSED YOU THE MOST ABOUT TEENAGE GIRLS
32 IF ELON MUSK WASN'T SHORT FOR ELONGATED MUSKRAT WHAT WOULD IT BE SHORT FOR
19 WHATS AN NSFW FACT ABOUT HISTORY THAT WE DON'T GET TO HEAR TOO OFTEN
26 COPS MOST SUSPICIOUS THING YOU'VE EVER CAUGHT SOMEBODY DOING FOR A TOTALLY LEGITIMATE REASON
18 YOUR I HATED THAT PERSON BUT THEY DIDN'T DESERVE THAT STORY
29 WHAT DO PEOPLE THINK IS HEALTHY BUT REALLY ISNT
28 WHATS SOMETHING WRONG YOU SAW YOUR PARENTS DOING AS A KID BUT DIDNT REALIZE IT WAS WRONG UNTIL YO...
22 SERIOUS ORS WHO GAVE UP PURSUING THEIR 'DREAM' TO SETTLE FOR A MORE SECURE OR COMFORTABLE LIFE HO...