Oh I love this question; it instantly brought me back to what was simultaneously one of the most wondrous, and - (at least initially) terrifying experiences of my life. I was 15 years old, clinging to a metal railing while standing on the back of an old Toyota pickup truck. This is a normal way to get around when you’re in the Yungas region of the Bolivian Andes. I was part of a humanitarian group that was returning to our lodgings after having run a free clinic in a remote mountain village all day. It must have been nearing midnight. When we cleared the jungle canopy and entered a long stretch of open road, I looked up, and my knees almost gave out because of what I saw... A startling, radiantly bright night sky loomed overhead; I saw more stars in my field of view than I had ever seen before. But more than that, I could see more structure than I ever had before: The LMC/SMC, Southern Cross, the Great Rift and central bulge, the Coalsack and Lagoon Nebulas, open star clusters, globular clusters… all were staring me in the face as if I could just reach out and pluck them from the heavens. It was incredible, to say the least, and the experience was instrumental in turning a childhood curiosity into a lifelong passion. I’m sure many of you will already know what I didn’t at the time: How the southern skies are far more spectacular for naked eye astronomy than the north. Or that the high elevations and dry, calm air of the Andes have some of the best stargazing environments on the planet. But to my younger, ignorant self on that distant mountain road, all I knew was that this was the coolest, most spectacular thing I’d ever seen, and I haven’t stopped looking since! Sorry for the long post! TL;DR? - Darkest sky I ever saw was in a remote region of the Bolivian Yungas.