Tent City

What does a temporary tent city for 3 million people look like? A recent visit to Expo 2010 in Shanghai clued me in to what is probably the largest ephemeral urban design in the world, the Mina Tent City in Saudi Arabia, erected each year to house Hajj pilgrims visiting Mecca during the last month of the lunar Islamic calendar. 
— Via bricoleurbanism 

Image and content credit: bricoleurbanism