A woman walks past a banner during the Afghanistan and Central Asia's only Arts Festival in Kabul, Afghanistan, Wednesday, May 1, 2013. The festival is held at the Esteqlal high school.
People carry Cuban flags during the annual May Day march near a building covered with an image of Venezuela's late President Hugo Chavez, right, and late Cuban union leader Lazaro Pena in Revolution Square in Havana, Cuba, Wednesday, May 1, 2013. Workers held protests, parades, strikes and other demonstrations in cities across the world on Wednesday.
Kentucky Derby hopefuls Falling Sky, left to right, Charming Kitten and Black Onyx go for a morning workout at Churchill Downs Wednesday, May 1, 2013, in Louisville, Ky.
A petrol bomb flames at the feet of police during clashes between protesters and police during the annual May Day march in Santiago, Chile, Wednesday, May 1, 2013. In protests, parades, strikes and other demonstrations held in cities across the planet, activists lashed out at political and business leaders they allege have ignored workers' voices or enriched themselves at the expense of laborers during what has been a difficult few years for the global economy. In some places, the demonstrations turned violent, with activists clashing with police.
A kniphofia, otherwise referred to as a red hot poker, comes into full bloom at the Sarah P. Duke Gardens in Durham, N.C., Wednesday, May 1, 2013. April showers and warming weather has brought spring flowers into bloom at Duke Gardens, a 55 acre horticultural showplace nestled in the heart of the Duke University campus.
Part of more than 1.4 million feet of painted, hand-knotted-rope by artist Orly Gender titled "Red, Yellow and Blue," is installed in Madison Square Park on Wednesday, May 1, 2013 in New York. The installation will be on view until Sept. 8.