Pyramids of Giza
This is the oldest of the Seven Wonders of the Ancient World and the only one still intact. It was built for King Khufu (or King Cheops in Greek). The reason the Egyptians built pyramids is that they believe every person has a double, or ka as they called it, which does not die when we die. They believed the ka would survive better if it is preserved against hunger, violence and decay. They built the pyramids to protect the kas of the most important people, the pharaohs.
Karnak Temple
The Karnak Temple is actually a complex of many temples. The three main temples are the temples of Amun, Mut and Mont, the biggest of which is th etemple of Amun. Some of the smaller temples are the temples of Ptah, Khonsu, Opet, and Osiris Hek-Djet. All these temples are to honor the gods of which the temples are named.