Can't make it to the UK to see the solstice next month at Stonehenge? Try NYC this year on May 29th at 8:13 PM or May 30th at 8:12 pm according to the NY Times. For more info on this unique opportunity, see the page.
It is all about the earth's tilt with respect to the sun. Cool stuff. See Sunpath diagrams to to find how to track sun movement across our skies.