An observation tower is a structure built to offer an elevated view of the surrounding area. There are several alternative names for observation tower, like lookout tower, watchtower, belvedere, viewpoint tower, and sky tower. Lookout tower is commonly used to suggest a high point from which to scan the horizon for dangers, such as fires, while belvedere refers more to a platform or structure designed to offer a scenic view. The term viewpoint tower is usually used for a structure built for tourists who want to enjoy a panoramic view of a city or natural surroundings. The sky tower name is often used for taller towers, like radio or communication towers, that offer a bird's eye view of the area.