A beautiful and trippy time-lapse video of the midnight sun in Iceland, filmed in June of 2011. From the vimeo description:
Iceland is a landscape photographers paradise and playground, and should be number 1 on every photographers must visit list. Iceland during the Midnight Sun is in sort of a permanent state of sunset. The sun never full sets and travels horizontally across the horizon throughout the night, as can be seen in the opening shot and at the :51 second mark in the video.
During the Arctic summer, sunset was at midnight and sunrise was at 3am. The Arctic summer sun provided 24 hours a day of light, with as much as 6 hours daily of "Golden light". Once the sun had set it wouldn't even get dark enough for the stars to come out, and they don't start to reappear until August.