The phrase "to build a tower" means to create or construct a tall structure that reaches high into the sky, often with several floors or levels. Full definition
He is trying to put one shaped toy into the other one with the clumsy movements, is building a tower of blocks, assembling a pyramid. (bebezclub.com)
The merchants built the towers with single rooms on each floor: bottom commercial, second living, third bedroom, etc and kitchen at the top with a roof garden. (housegoeshome.com)
On certain maps, the path of the aliens can be blocked by building towers, forcing them to find another route to the cores. (psnstores.com)