HOW? WHY? WHO? WHEN?
Notice the large human sized stair case at bottom right... Now imagine how huge this structure was, in contrast to the stones in those stairs. The stone blocks of granite in the foreground, base of this structure and the one piece columns, must be well over 12,000 plus tons and perhaps much more.
You do not build this with ropes and horses, which could have been useless given the shape of this building. You would have to have about 230,000 hands on any of those foundation blocks to move them, and you could never get that many, regular sized humans in the space needed, to get all those hands on them... Even by today's construction standards, we have NO known machines or technology that can move, cut or pile, granite stones of this size. Many of those stones are the size of small buildings and precision cut. This structure is one of many in Puma Puku and was built well over 14,000 years ago. That was before the stone age...