geography A quick tour of Earth's many gates to Hell Popkin

complex rescue missions Rescuers on 5th day trying to save US explorer who became ill 3,400 feet below Turkish cave (video) Carla Sinclair

caves The satisfaction of dropping a rock down the deepest pit in America and hearing it hit the bottom (video) David Pescovitz

dogs Abby the dog rescued after 2 months in a cave Jennifer Sandlin

sinkholes Forest grows in a giant, 630ft-deep sinkhole Rob Beschizza

mysteries Video finally reveals what's at the bottom of Yemen's Well of Hell David Pescovitz

native americans A Missouri cave filled with 1,000-year-old indigenous paintings sold at auction and the Osage Nation want it back David Pescovitz

caves Stefania Follini was isolated in a cave for 131 days for science Andrea James

caves Watch: cycling to work through cavernous limestone mines turned into a business park Rob Beschizza

puppets These otherworldly caves in Bermuda were the birthplace of Fraggle Rock David Pescovitz

News All 12 boys rescued from Thai cave Rob Beschizza

china The last of China's cave dwellers want nothing to do with modern housing Séamus Bellamy

video WATCH: Remarkable 4K timelapse of glow worm cave in NZ Andrea James

"Uri Tupka and the Gods" is a cold, dark, and magnificent trek through Mike Mignola's Lands Unknown Gareth Branwyn

Environment Nature reclaims abandoned shoes in the woods Popkin

music "Stranger Than Kindness" is the incredible new Nick Cave virtual exhibition Jennifer Sandlin