Crowds gathered to mark the summer solstice at Stonehenge, near Salisbury, in England, watch as the sun rises, Tuesday June 21, 2005. The ancient stone circle of Stonehenge is a World Heritage Site erected between approximately 3000BC and 1600BC and despite years of research the reason behind its construction remains a mystery. The summer solstice in the northern hemisphere occurs annually on June 21 and is the time at which the sun is at its northernmost point in the sky. (AP Photo/Matt Dunham)