Giza is the site of the largest pyramids built in Egypt.
in Eygypt
The ancient Mexicans (and Egyptians) - for religious reasons.
Actually, several ancient civilizations built pyramids, usually for religious purposes. The largest and best known were built by the Egyptians several thousand years ago, but there are pyramids in Mexico and Central America as well.
To take the kings and their belongings to heaven with them
There are several pyramids not only in Egypt. The largest is the great pyramidof Khufu at Giza
khufu fourth dynasty Pharaoh, known to the Greeks as Cheops
limestone and granite were the main materials used to build pyramids. Some of the later pyramids were made from mud brick with a casing of limestone.
the first two are in Egypt but the third (and possibly 5th) are in central Mexico (the Aztecs built them)
The three main pyramids of Giza belong to the Pharaohs of ancient Egypt: the Great Pyramid, built for Pharaoh Khufu (Cheops), is the largest; the Pyramid of Khafre, built for his son Pharaoh Khafre, is slightly smaller; and the Pyramid of Menkaure, the smallest of the three, was constructed for Pharaoh Menkaure. These pyramids were part of a complex that served as monumental tombs and symbols of the pharaohs' power and divine status.
they were step pyramids built out of stone
The pyramids were built in the Kingdom of Egypt.