Image 1 Caption: "All Giza Pyramids (c.2600--c.2500 BCE) in one shot." (Somewhat edited.)

The Giza Pyramids are astronomical monuments, so and objects of interest to archaeoastronomy. But their astronomical features are just minor subsidiary features. Note the ancient Egyptians were literate---they had their Egyptian hieroglyphic writing---and so are an early historic society, NOT a prehistoric society.

Features:

1. The Giza Pyramids were built in the 26th century BCE by the pharaohs Khufu (fl. 2580 BCE, AKA Cheops), Khafre (fl. 2570 BCE), and Menkaure (fl. 2520 BCE), all of the 4th Dynasty of the Old Kingdom of ancient Egypt. They were the tombs of these pharaohs.

   Of course, all the tombs of the pharaohs of all the ancient Egyptian dynasties were looted in ancient times with singular exception of the Tomb of Tutankhamun, which was largely, but NOT completely, unlooted.

2. The Giza Pyramids are the only surviving wonders of the Seven Wonders of the Ancient World. This is because they are essentially big hills of stone in the Western Desert of Egypt and NOT fragile, finicky things. However, the casing of white limestone that gave the sides of the Giza Pyramids a smooth appearance has mostly been lost due to quarrying in the Middle Ages and later (see Wikipedia: Great Pyramid of Giza: Casing; Wikipedia: Pyramid of Khafre: History) or was never completed (see Wikipedia: Pyramid of Menkaure: Size and construction) or some combination thereof.

   

3. Image 2 Caption: A map of the Map of Giza Necropolis (c.2600--c.2500 BCE) with the Giza Pyramids (c.2600--c.2500 BCE) and the Great Sphinx of Giza (c.2558--c.2532 BCE).

4. The faces of the Giza Pyramids are aligned with the cardinal directions: north, south, east, west (see Wikipedia: Giza pyramid complex: Astronomy). Thus, the Giza Pyramids are astronomical monuments and objects of interest to archaeoastronomy.

   There may be other astro-alignments built into the Giza Pyramids (see John North 1994, The Norton History of Astronomy and Cosmology, p. 9; Wikipedia: Giza Pyramids: Astronomy).

5. It must be emphasized the Giza Pyramids were primarily tombs for the pharaohs. The astro-alignments are just minor subsidiary features.

6. It is a fascinating coincidence---if coincidence it be---that the building of the Giza Pyramids in the 26th century BCE was roughly coincident in time with the construction of the major features of Stonehenge: the sarsen stone ring of standing stones connected by lintels and the enclosed horseshoe pattern of 5 huge sarsen stone trilithons (see Wikipedia: Stonehenge 3 II (2600 BC to 2400 BC).

7. The Giza Pyramids make you wonder about people who build absurd structures in the middle of the desert. Think of---well---Las Vegas---The Luxor, The Sphere, etc.

   Howsoever, it's a melancholy thought that because the Giza Pyramids are piles of rock in the desert, they may well still be standing when all other remaining human artifacts are geological strata:

   ... Nothing beside remains. Round the decay
   Of that colossal wreck, boundless and bare
   The lone and level sands stretch far away.
   
   ---Ozymandias (1818), Percy Bysshe Shelley (1792--1822).

8. See also Pyramids of Giza and Great Sphinx Walking Tour - 4KUHD - with Captions | 2:42:17.

Images:

1. Credit/Permission: © Ricardo Liberato (AKA User:Riclib), 2006 / Creative Commons CC BY-SA 2.0.
   Image link: Wikipedia: File:All Gizah Pyramids.jpg.
   
2. Credit/Permission: © User:MesserWoland, 2006 / CC BY-SA 3.0.
   Image link: Wikipedia: File:Giza pyramid complex (map).svg.