Studenec, Observation tower on Studenec mountain, Czech Republic

Kaltenberg is an observation tower on Studenec mountain in the Czech Republic, built from metal and situated at an elevation of 736 meters. From this vantage point, visitors can see across the Lusatian Mountains and the Bohemian-Saxon Switzerland region.

Prince Ferdinand Kinsky had a wooden viewing frame built on the summit in 1854; it was demolished in 1865 because it had become unsafe. A steel lattice tower by the Prague machine works followed, inaugurated on 18 July 1888, 17 m high with 92 steps and room for 25 people on the platform. More than 5,000 visitors came in its first year, prompting Kinsky to add a wooden shelter hut on the summit.

The German name Kaltenberg comes from an unusually cold spring on the northeast slope; the Czech name Studenec literally means well or spring. In the 19th century the peak was also called Ferdinandův kámen after the Kinsky owner. The villages of Líska, Lipnice and Studený lie directly at the foot of the mountain.

The structure is accessible to visitors following a complete renovation in 2009, which was funded through grants and private donations. Bring sturdy shoes, as the path to the summit can be steep and rocky in places.

A memorial stone on the summit reads 'MONUMENTUM ASTRONOMICO-GEOMETRICUM', recalling that in the 19th century the open summit served surveyors and cartographers mapping Bohemia. The mountain was also called Ferdinandův kámen (Ferdinand's Stone) in the 19th century, after the Kinsky owner.