The Guoliang Tunnel is a remarkable feat of engineering and human perseverance, carved into the Taihang Mountains in China’s Henan Province. Here’s what makes it so fascinating: A Village’s Determination Isolation: The village of Guoliang was once incredibly isolated, accessible only by a treacherous, narrow staircase carved into the mountainside, known as the “Sky Ladder.” Need for Connection: To improve their lives and connect with the outside world, the villagers decided to build a road throu

China’s terrifying cliffside tunnel