5. Moscow’s Light Pillars
This optical phenomenon recalls something out of a sci-fi movie; however, the geological formation of light pillars is quite naturally created by the reflection of sunlight or moonlight cast through ice crystals present in the Earth’s atmosphere. The thin vertical columns appear below a light source when the sun is low or hanging beyond the horizon. The light pillars in Moscow are prominently visible at certain times of year, casting eerie arcs of light over the city.