Saqsaywaman is an Incan fortress above Cusco.
The walls are made of slightly irregular blocks fit perfectly together. Because they are irregular shapes, it was too difficult to steal the blocks and put them back together, so it is still standing.
This big hole in the ground is next to it.
The doorway was huge.
The site also contained other buildings, which have been largely demolished, and a big hill with a cemetery.
You can see the City of Cusco is very close to the ruins.
