At its peak, an estimated 50,000 people lived on just six acres with no government, laws, or sunlight. This was the Kowloon Walled City in Hong Kong, which had a population density of 120 times that of...

Yu Juanjuan is the only person to have successfully biked the border of China. Biking nearly 40,000 kilometers, almost the circumference of the Earth, and along the way, she faced life-threatening occasions...