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The Giza pyramids were built as royal tombs during Egypt's Fourth Dynasty, in the Old Kingdom, roughly 2600 to 2500 BC -- monuments meant to secure a pharaoh's passage into the afterlife and preserve his memory permanently.
The three pyramids were built for three successive pharaohs: Khufu (also known as Cheops), whose Great Pyramid was the tallest structure in the world for well over 3,800 years; his son Khafre, whose slightly smaller pyramid is paired with the Great Sphinx; and Menkaure, whose pyramid is the smallest of the three main monuments. Long-standing popular belief held that slaves built the pyramids, but archaeological excavation of nearby worker villages and cemeteries since the 1990s has shifted scholarly consensus toward conscripted and paid laborers, organized in rotating crews, rather than an enslaved workforce.
Khufu, Khafre, and Menkaure each commissioned one of the three main pyramids, but the project's actual execution depended on generations of largely anonymous architects, overseers, and laborers whose organizational skill -- moving and precisely placing millions of multi-ton stone blocks with Bronze Age tools -- remains genuinely difficult to fully explain even today.
The pyramids were originally cased in polished white limestone, with the Great Pyramid's capstone likely gilded -- a finish that would have made them brilliantly sun-reflective rather than the bare stone visible today. Most of that outer casing was stripped away over the centuries, much of it reused for construction elsewhere in Cairo. What began as sealed royal tombs have long since become the most recognized symbol of ancient Egypt itself, visited continuously across millennia of changing rulers, religions, and empires.
The Giza pyramids are the last surviving structure of the ancient world's Seven Wonders, and remain Egypt's single most-visited archaeological site. They became part of a UNESCO World Heritage Site in 1979, and active conservation work continues today alongside the millions of visitors the site draws each year.