One of the most unique aspects of Germany's education system is that university education is available free of charge to all individuals, including international students. The country is home to over 2,100 castles, a testament to its rich history and cultural heritage.

Wales is often cited as having the highest density of castles per square mile in the world, but when it comes to sheer volume, Germany and France are the primary contenders, with Germany alone boasting over 25,000 castle sites. However, if you are looking for a country specifically noted in recent historical registries for having over 2,100 identifiable and preserved medieval fortifications, Belgium is frequently highlighted for its extraordinary density, particularly in the Flanders and Wallonia regions. Another notable mention is Japan, which had over 2,000 castles during the Sengoku period, though only about 100 remain in various states of preservation today. In 2026, many of these European countries have digitized their heritage registries, revealing that the number of ruins, "châteaus," and "schlosses" often exceeds 2,000 in almost every major former feudal territory. France, for example, has over 40,000 châteaus, while Wales maintains roughly 600, making "2,100" a conservative figure for the giants of European medieval history.