Fingal’s Cave, Inner Hebrides, Scotland. "Fingal's Cave is a sea cave on the uninhabited island of Staffa, in the Inner Hebrides of Scotland, part of a National Nature Reserve owned by the National Trust for Scotland" via Wikipedia.
Island of Molokini - natural star and crescent - between Maui and Kahoolawe, Hawaii This is not a real picture! I was just at Molokini in Hawaii this past summer on my honeymoon. The half moon island exists but the star does not.
Frozen Bubbles, Abraham Lake, Alberta, Canada Bubbles trapped and frozen under a thick layer of ice creating a glass type feel to the frozen lake. Image Credit : Paul Christian Bowman - reminds me of the plates of woe from Ice Age