The castle with its Neo-gothic Lademacher Tower, which is decorated with pointed vaults and apertures, is among the first samples of eclecticism in the architecture of Latvian manor houses. It is the tower that has become one of the landmarks of Cēsis. It is also the place where the Latvian maroon-white-maroon flag has been raised since 1988, reminding of Cēsis as the origin of the flag.
The Cesis New Castle was built in 1777 as a residence for Karl Eberhard von Sievers and as part of a medieval castle fortification system - in place of a protective building for the tower and the gates. Today, it is operated by the Cesis History and Art Museum.
The tower of the castle offers the best view of the Cēsis Castle ruins, the old town, and St John's Lutheran church.