The Hohe Acht is a tertiary volcano, the highest peak in the Eifel, rising 747 m above sea level. It is immediately east of Adenau. The Kaiser-Wilhelm-tower has stood on the peak since 1909. The tower was built from 1908 to 1909 on the occasion of the silver wedding of Emperor Wilhelm II and Empress Augusta Victoria. The 16.3 m high tower was designed by architect Freiherr von Tettau and became a protected monument in 1987. The tower offers extensive views of the Eifel landscape.