Milad tower 
https://www.google.com/maps/place/Milad+Tower/@35.7448427,51.374774,19z/data=!3m1!4b1!4m12!1m6!3m5!1s0x3f8e0710d5918403:0x74f5290b67841378!2sMilad+Tower!8m2!3d35.7448416!4d51.3753212!3m4!1s0x3f8e0710d5918403:0x74f5290b67841378!8m2!3d35.7448416!4d51.3753212?hl=en
The Milad tower complex, offers you different type of art galleries and variety of annual festivals as well as some sport facilities such as zip line in a beautiful and well organized atmosphere.
Also you can have an unforgettable meal in one of its restaurants in the evening.
These last tree photos
are taken in Baame Tehran (around 2017), that you can enjoy for its nice view of Tehran and Milad Tower from far distance