With the announcement last week that Pyeongchang, South Korea will the 2018 Winter Olympics, the race is now own for the 2020 Summer Games.
Today, Madrid, Spain and Istanbul, Turkey both confirmed interest in hosting the 2020 Summer Olympics.
The competing cities join Rome, Italy which declared a bid earlier this year. Many are speculating that Tokyo, Japan will announce its bid as early as next week.
The deadline for cities to bid on the 2020 Games is July 29. The host city will be announced in 2013.