Why are temples placed at the top on pyramids?

This temple is named Phnom Bakheng. It is a Khmer Hindu temple from Angkor in Cambodia, and like the Mayan pyramids your source references, this buildings also in the form of a pyramid. read more

Generally temples aren't placed on top of pyramids in most instances. The Egyptians didn't go this for example. The example you give is a Maya one. Maya religion appears to be linked closely to sun worship so a temple near the sky makes some sense. read more

The top of a pyramid is called a pyramidion or a capstone. Pyramidion means a small pyramid which it was and thus the name. During old kingdom period they were made of limestone or granite and covered with gold or electric to allow them to dazzle with the light of the sun. The pyramidion of later periods were mainly made of granite. read more

Pyramids are all shaped similarly, but pyramids constructed by different cultures each have their own peculiarities. The Mayan version of the pyramid is shorter than some others, and experts believe that this was to leave room for a temple on the top. And not all Mayan pyramids are constructed alike. read more