The Maiden Tower is the oldest structure in Baku’s old walled city. No one is entirely sure when it was built, or for what purpose, or even the origins of the name. Yet this mysterious and curious tower is a symbol of Azerbaijan’s capital city and even appears on the national currency, the Azerbaijani manat Many experts believe the tower was completed in the 12th century, along with most of the medieval walled city. But the different appearance of the stones that form the foundation and the first three stories suggests the original structure may date as far back as 600 BC..The tall cylindrical Maiden Tower in Baku stands 29.5 metres (97 feet) with a 16.5 metre-diameter (54 feet). The walls of the eight-storied structure are 5 metres (16.4 feet) thick at the base and estimates suggest 200 people can fit inside. Maiden Tower, also called Giza Galasy in Azerbaijani, has always been the centre of mystery and legends. Probably because no one really knows its age, function or historical context.