Russian Cossacks perform during the annual Mansky festival, near the Mana river in Russia. (REUTERS/Ilya Naymushin)

Members of a local troupe perform during the commemoration of the Algerian War of Independence in Setif, Algeria. (REUTERS/Louafi Larbi/CORBIS)

Bedouins dance during the Sanaa Summer Festival in Sanaa, Yemen. (REUTERS/Khaled Abdullah)

Dancers perform at a hotel in Honiara, Solomon Islands. (REUTERS/Daniel Munoz)

Traditional Tsam folk dancers perform in the mountains south of Mongolia's capital city Ulan Bator. (Kieran Doherty/In Pictures/Corbis)

Belarusian women take part in the Rusalle festival (the holiday of mermaids) in the village of Sosny, Belarus. (REUTERS/Vasily Fedosenko)

Irish girls take part in a traditional Irish step dance in a Galway courtyard. (Barry Lewis/In Pictures/Corbis)

Women perform at a traditional wedding ceremony in the village of Galicnik, Macedonia. (REUTERS/Ognen Teofilovski)

A widow dressed as the Hindu god Krishna dances during the Janmashtami festival in Vrindavan, India. (REUTERS/Ahmad Masood)

People watch the Abbots Bromley Horn Dance in England. (REUTERS/Darren Staples)

Women in traditional dress commemorate El Salvador's Independence Day. (REUTERS/Ulises Rodriguez)

The "Whirling Dervishes," or Sufi Whirling, dancers perform in Turkey. (MORANDI Bruno/Hemis/Corbis)