Unkai Terrace is located atop a mountain peak on the island of Hokkaido in Japan, offering tourists breathtaking views of clouds floating below. Unkai (meaning sea of clouds) is a very rare natural phenomenon, usually only seen under certain weather conditions. On clear days, you have to take a gondola ride up to the terrace early in the morning to catch the clouds in action.
Photo by Yosuke Kashiwakura
The crows that live in Tokyo build their nests out of metal clothes-hangers. In such a large city, there are few trees, so the natural materials that crows need to make their nests are scarce. As a result, the crows steal hangers from the people who live in apartments nearby, and carefully assemble them into nests. The completed nests almost look like works of art based on the theme of recycling.