The Lookout Tower on the summit of Sitno is a wooden structure with a square ground plan and a pyramid roof, and it is one of the oldest buildings of its kind in Europe.
It was rebuilt in 1736 from an original summer house (a gazebo) that Andrej Jozef Koháry, owner of the manor house in Svätý Anton, had built in 1727.
In 1852 the tower was struck by lightning and burnt down, but in 1888 it was rebuilt at the initiative of Dr Edmund Viliam Téry, physician to the Coburg family. Today the 12 m wooden tower serves as a field base for the Štiavnica Mountains Protected Landscape Area.
The summit of Sitno offers a magnificent all-round view, in good weather as far as the Low Tatras and the Mátra hills in Hungary. Near the tower there is also a mountain hut with overnight accommodation.