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The Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world. Its colors match the rainbow dispersion of white light by an optical prism: red, orange, yellow, green, and blue. The vivid colors in the spring are the result of pigmented bacteria in the microbial mats that grow around the edges of the mineral-rich water.
This image is of the Porte D'Aval rock formation in Etretat, France, located on the coast of Normandy. Etretat is best known for its cliffs, including three natural arches and the pointed "needle" as seen here.