"highest tower" is grammatically correct and can be used in written English.
It can be used in a variety of contexts; for example, "The highest tower in the city was visible for miles."
The highest tower in the project will have 21 stories.
A triangular red flag flew on its highest tower.
The walls did not crumble, and the Hezbollah flag now flies from the highest tower.
Carved into the window ledge of the highest tower in a Crusader castle".
As the world's highest tower (and the second-tallest structure after the Burj Khalifa in Dubai), this could even give Godzilla a new target for his atomic wrath.
Spaghetti Challenge This activity sheet from the Science Museum gets students working together to build the highest tower possible out of spaghetti and marshmallows.
"I really loved it," he says of the ultrasophisticated apartment, situated in one of the highest towers in the principality.
One of the greatest and most challenging journeys we undertook was to climb one of Antarctica's highest towers in the winter darkness and extreme cold.
Its Moorish minaret was the second-highest tower in the city, and its auditorium was the largest in the world.
Who is this High Tower guy?
Not even with superlatives does one get very far: how many times as high as a high tower is a very high tower?
