Sitnyakovo, Art Nouveau residence in Rila Mountain, Bulgaria.

Sitnyakovo is a royal residence on Rila mountain near the Borovets resort and the Tsarska Bistritsa palace. Architect Georgi Fingov designed it with the utilitarian high-mountain construction of a hunting residence, finished with coherent Art Nouveau decoration and interior furnishing. It consists of a residential part and rooms for servants and guards.

Sitnyakovo was commissioned by Ferdinand I of Bulgaria and built in 1904 to designs by architect Georgi Fingov. In 1913, at Sitnyakovo, Ferdinand I signed the treaty among the Balkan countries ahead of the Balkan Wars. After the fall of the monarchy and during the communist regime, the house was used by the Writers' Union; in the early 21st century Simeon Saxe-Coburg-Gotha and his sister Maria Luisa Hrobok claimed ownership, and after five years of court cases the Supreme Court of Cassation returned it to the state.

Sitnyakovo takes its name from the surrounding area, and a boulevard in Sofia is also named after it. Under the communist regime the former royal villa served as a rest home for the Union of Bulgarian Writers, and Todor Zhivkov was among its visitors. In the early 21st century Simeon Saxe-Coburg-Gotha and his sister Maria Luisa Hrobok claimed the property, receiving ownership documents in 2003 from the Sofia regional administration signed by governor Olimpi Katev.

Sitnyakovo is a private royal residence on Rila mountain, near the Borovets resort and the Tsarska Bistritsa palace; it is not open to tourists, so visits should not be planned. The building can be seen from outside while walking or skiing in the Borovets area. Access to the interior depends on the owner, the former tsar Simeon II.

The structure merges traditional high-mountain construction methods with Art Nouveau design principles in a way rarely seen in Bulgaria. This blend of local craftsmanship and European style makes it a distinctive example of its era.