A group of protesters, from all around Lithuania, gather at the Television Tower to protect it from approaching Soviet tanks and paratroopers.

Each year, 60,000 people from around the globe gather in a dusty windswept Nevada desert to build a temporary city, collaborating on large-scale art and partying for a week before burning a giant effigy in a ritual frenzy. Spark takes a peek behind the curtain with Burning Man organizers and participants, revealing a year of unprecedented challenges and growth.

Can you get to know someone through a closed door?