Millions have been in the tent city of Mina in Mecca for the annual Hajj pilgrimage. Though the crowds are temporary, the infrastructure built to handle them is permanent.
Nov 24, 2010 The Pop-Up City
Millions of religious pilgrims travel to Mecca in Saudi Arabia every year for the Hajj. Officials there have been updating the city to better handle the crowds.
Nov 19, 2010 NPR
New plans have been released by Gensler that show a proposed expansion of the holy city of Mecca.
Nov 30, 2009 The Architect's Journal