Boys jump over a firehose sprinkler

Photo: Janek Skarzynski/AFP/Getty Images

Solstice celebrations

A group of boys leap over water spraying out of a fire hose on June 20 in downtown Warsaw, Poland.

June 21 marks this year's summer solstice — the official start of nearly every child's favorite season.

Whether you're communing with the druids at Stonehenge or practicing some solstice yoga in Times Square, there are plenty of midsummer activities to celebrate the impending heat.

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Muddy Pakistani children play in the Ravi River in Lahore

Photo: Arif Ali/AFP/Getty Images

Mud-covered children dash across the shallows of the Ravi river on June 19 in Lahore, Pakistan.

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A wet dog jumps out of a fountain

Photo: Alexander Klein/AFP/Getty Images

A black and white dog jumps out of a fountain on June 18 in Vienna, Austria.

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Pakistani children jump in a canal

Photo: Rizwan Tabassum/AFP/Getty Images

Pakistani youth plunge into the blue-green waters of the Hub canal on June 19 in Karachi, Pakistan.

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Catie Leary is a photo editor at Mother Nature Network. Follow her on Twitter and Google+.