Eiffel Tower
The difficulty building the first floor was in bringing building materials and people up to it with a point of departure as in the elevators. The elevators had to be positioned at a slanting angle to meet the horizontal beams on the first floor. The elevator had to use hydraulic jacks to move and erect the elevator up the slanted legs. Currently the hydraulic jacks are not in use due to more advanced technology. The second floor was assembled with cranes that took the same route as the elevators. There was no troubles from this point onward in the construction.