A large inner tower in a medieval castle—see image of castle. The word comes from the French for "young girl" or "daughter". Donjons were usually built by wealthy landowners as a means to defend their estates against attack, and as a place to hold prisoners. They often served as administrative centers for the surrounding land. Donjons are found in many different countries around the world, including England, France, Germany, Spain, Italy, Switzerland, Turkey, Israel, Lebanon, Syria, and India. Some examples include: the Tower of London, Saint-Louis en LÎle-Saint-Louis, and Château de Versailles. They can be seen in movies, television shows, and books too. For example, you might see them in the background of some scenes in the Lord of the Rings film series. Donjons were usually made of stone but sometimes they were also built with wood, earth, or brick. Their walls were usually very high (up to 60 meters or 200 feet) to provide protection against attacks by enemies who may have had weapons that could damage walls over shorter distances than those within the castles' own defenses.