Ochaidi Memorial Tower Introduction: Located near Tehran Airport, it was built in 1971 to commemorate the 2500th anniversary of the founding of the Iranian Empire. Also known as the "Freedom Monument", it is a symbol of Tehran. There are 2,500 stones of various types on the front of the memorial tower, with a total of 15,000 different forms, in an inverted Y shape. The building is 50 meters high, of which 18 meters is the underground floor (the underground floor is the exhibition hall). It is a majestic tower building made entirely of reinforced concrete, with a height of three floors. It is a combination of ancient architecture and Islamic architecture.