London locks down for the Olympics
May 30, 2012
On July 7, 2005, one day after Londoners received word that the city would host the 2012 Olympics, terrorist bombs tore through the public transit system, killing 56 people. To prevent a repeat attack and protect the roughly 25,000 athletes, family members, coaches, and officials attending (along with roughly 700,000 spectators), spending on security has topped $1.6 billion. Sydney's pre-9/11 Olympic security in 2000 cost only $179.6 million.
Read the full story at Fortune.