Most of the German universities are public institutions, and students traditionally study without fee payment. The general requirement for university is the . According to an OECD report in 2014, Germany is the world's third leading destination for international study. The established universities in Germany include some of the oldest in the world, with Heidelberg University (established in 1386) being the oldest. The Humboldt University of Berlin, founded in 1810 by the liberal educational reformer Wilhelm von Humboldt, became the academic model for many Western universities. In the contemporary era Germany has developed eleven Universities of Excellence.