Wikipedia:   The Olympiaturm has an overall height of 291 m and a weight of 52,500 tonnes. At a height of 190 m there is an observation platform as well as a small rock and roll museum housing various memorabilia. Since its opening in 1968 the tower has registered over 35 million visitors (as of 2004). At a height of 182 m there is a revolving restaurant that seats 230 people. A full revolution takes 53 minutes. The tower has one Deutsche Telekom maintenance elevator with a speed of 4 m/s, as well as two visitor lifts with a speed of 7 m/s which have a capacity of about 30 people per car. The travel time is about 30 seconds.