Ada Ciganlija

A man sunbathes at Ada Ciganlija lake in Belgrade, Serbia, Thursday, June 20, 2013. The Balkan region is experiencing a heat wave, with temperatures rising as high as 37 degrees Celsius (99 Fahrenheit).

Marko Drobnjakovic/AP

A man sunbathes at Ada Ciganlija lake in Belgrade, Serbia. The Balkan region is experiencing a heat wave, with temperatures rising as high as 37 degrees Celsius (99 Fahrenheit).