Everytime I see the tower it looks very old and ru...

Everytime I see the tower it looks very old and rusty. It's the thing you don't see or feel in the pictures.
Nowadays visitors have to go past security control checkpoints to get to the tower and there's a glass wall in front. You can't just walk directly from the Pont d'lena, under the tower to Champ de mars anymore.
A full price ticket to the tower costs about 20-25 depends on how you like to walk up the stairs or get the elevators. You can easily spend a few hours at the tower. There's a souvenir shop, cafes and restaurants at 2nd floor and every floor (level) has amazing views. It's really worth the ticket fee not like some other towers (Yes, I mean you Fernsehturm Berlin.).