Towers serve all sorts of purposes. Whether built for defensive reasons, religious services, or as a means of telecommunication, these unique structures rank among some of the most impressive architecture ever conceived. Technically, towers are distinguished from "buildings" in that they are not constructed to be habitable but to serve other functions. However, this list includes examples of skyscrapers that are considered multi-functional.
Browse this gallery and journey into the clouds with this overview of historic and iconic towers from around the world.