A group of students from Missoula, Mont., run through a fountain to cool off in New York on June 20, 2012, the summer solstice and longest day of the year. The National Weather Service has forecast potentially record-breaking temperatures just as the season officially begins. (Associated Press)
Revellers cheer as the sun finally breaks through the clouds more than a couple of hours after sunrise during the summer solstice at Stonehenge, near Salisbury in England, Tuesday, June 21, 2011. (AP Photo/Matt Dunham)
Tourists are silhouetted against a late afternoon sky in between the columns at the Jefferson Memorial on the longest day of the year, the Summer Solstice, in Washington, D.C., Tuesday, June 21, 2011. (Rod Lamkey Jr./The Washington Times)