The Azadi Tower is the symbol of Tehran, Iran, and marks the entrance to this large metropolitan city.
Built in 1971 in commemoration of the 2500th anniversary of the Persian Empire, this large monument was named the Shahyad Tower (meaning "Remembrance of the Shahs (Kings)") but dubbed Azadi (Freedom) after the Iranian Revolution of 1979. It is 50 metres (148 feet) tall and is completely clad in cut marble.
The architect is Hossein Amanat who had won a competition to design the monument. Azadi Tower combines the Sassanid and Islamic architecture styles. It is a part of the Azadi cultural complex, located in Tehran's Azadi square in an area of some 50,000 mē. There is a museum and several fountains underneath the tower.
Reference :
http://en.wikipedia.org/wiki/Azadi_Tower