Císařský kámen, Observation tower in Liberec, Czech Republic

Cisarsky Kamen is a steel observation tower on the summit of the same name in the Jizera Mountains near Liberec, sitting at an elevation of about 2,090 feet (637 m). The tower is about 66 feet (20 m) tall and has an open viewing platform at the top that looks out over the surrounding mountains and forests.

The first tower, a six-storey spruce structure 20 m tall with a platform at 18.8 m, opened on 9 September 2009, the 230th anniversary of Joseph II's visit. Untreated wood decayed and it closed in 2017; it was demolished on 16 August 2018. A steel tower with wooden cladding, three metres taller, opened in November 2018.

Information panels at the top help visitors identify the peaks and villages visible across the Jizera Mountains. Standing on the platform makes the surrounding landscape easier to read and enjoy.

The tower is open year-round and sits along a hiking trail in the Jizera Mountains. A seasonal refreshment stop with a children's area is located a short walk away toward Radlo, making the visit easy to combine with a longer outing.

The steel frame of the current tower is fitted with decorative wooden elements that echo regional building traditions, which is noticeable when you look closely at the structure. The new tower also stands about 10 feet (3 m) taller than the wooden one it replaced.