The Palace of the Shirvanshahs is one of the architectural treasures in the Old historical City of Baku. This is a 15th-century Medieval residence, which was once built by the Shirvanshahs - the ruler family of the (long gone) state of Shirvan. As a historical monument, the Palace is part of the UNESCO World Heritage List and is boldly described as "the pearl" of the country's architecture. The place is open for visitors all around the year, it offers guided tours in different languages and has an entrance fee of about 5$.