One of the tallest towers in Europe (measuring over 300 meters) broadcasts telecommunication signals. Its construction was finished by the end of the 1970s and it is visible almost from everywhere in Frankfurt. Unfortunately, the tower is not accessible to the general public but even from the outside, the tower is remarkably stunning.
Wikipedia https://en.wikipedia.org/wiki/Europaturm
Address Ginnheimer Stadtweg 90, 60431 Frankfurt am Main, Germany
Coordinates 50°8'7.178" N 8°39'16.705" E