The Dark Knot at the Center

At the San Francisco Ballet School, young aspiring dancers come to terms with their growing pains as they strive to go pro.

In the middle of the Mojave desert, running enthusiasts from all over America come together to run an ultramarathon - 100 miles (160km) in 30 hours.

Colma, a small town in Northern California, just ten miles south of San Francisco, has come to be known as a modern-day necropolis: since its incorporation in 1924, it has gathered a little over a thousand inhabitants and just under 2 million graves. Some of the city's inhabitants and frequent visitors share their experiences and thoughts on what it's like to be alive among the dead.