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Huge steel cranes usually top skyscrapers, and are used to lift construction materials to the top.
These "climbing tower cranes" get to the tops of the buildings by climbing up a steel tower. The steel tower, also called a mast, is built in-place by the crane that climbs it.
At the ground a concrete base is poured and the first section of the tower is bolted deeply into it. The crane cab, arm, and counterweight are installed, along with hydraulic rams that can lift it a little bit at a time. A new tower section is lowered into place by the crane, and then the crane uses the hydraulic rams to move up onto the new tower section. As the building grows, so does the crane tower. When the building is finished, the crane climbs back down, taking the tower apart as it descends.
More about climbing tower cranes: http://www.howstuffworks.com/tower-crane.htm