Pyramid

A pyramid is a structure with visible surfaces that form a broad triangular outline. These surfaces converge toward a single point at the top, known as the apex. While the geometric shape often implies a square base, the base of a pyramid can actually be any polygon. This includes shapes like triangles or quadrilaterals. The structure can also be smooth or consist of several stepped levels. Because the cross-sectional area decreases as the elevation increases, most of the mass stays closer to the ground. This specific weight distribution allowed ancient civilizations to build massive, monumental structures.

In ancient Mesopotamia, people developed early pyramidal structures called ziggurats. These were built by various groups, including the Sumerians, Babylonians, Elamites, Akkadians, and Assyrians. Ziggurats were constructed using sun-dried mud-brick cores with outer facings of fired bricks. These facings were sometimes glazed in different colors and might have held astrological significance. A ziggurat typically featured between two and seven receding tiers built upon a rectangular, oval, or square platform. While they were part of larger temple complexes, most ziggurats had flat tops. People likely accessed shrines at the summit via spiral ramps or a series of ramps on one side.

Ancient Egypt is perhaps the most famous location for pyramid construction. Egyptians built these monuments from approximately 2700 BC until around 1700 BC. The very first pyramid was a step pyramid built for Pharaoh Djoser by his architect Imhotep. This structure consisted of six stacked mastabas, which are flat-roofed rectangular structures. Over time, kings like Snefru built more pyramids, reaching a peak at Giza between 2575 and 2150 BC. The Great Pyramid of Giza is the largest in Egypt and was the tallest structure in the world until 1311 AD. Most Egyptian pyramids were placed west of the Nile River. This location allowed the pharaoh's soul to join the sun during its descent.

While Egypt is well-known, Sudan contains the highest number of extant pyramids in the world. There are 220 pyramids remaining in Sudan, mostly serving as tombs for the kings and queens of Napata and Meroë. These Nubian pyramids differ from Egyptian ones because they have much steeper sides. Construction in Sudan continued as late as 200 AD. In West Africa, the Tomb of Askia in Mali serves as a different kind of monumental pyramid. Built at the end of the fifteenth century, this mud-building structure is 17 metres tall. It is a major example of the Sudano-Sahelian architectural style.

In the Americas, different cultures used the pyramid shape for various purposes. Mesoamerican pyramids were often stepped and featured temples on their summits. This design is more similar to the Mesopotamian ziggurat than the smooth Egyptian style. The Great Pyramid of Cholula in Mexico is the largest pyramid in the world by volume. It was constructed between the 3rd century BC and the 9th century AD. Another massive structure is the Pyramid of the Sun at Teotihuacan, which is the third largest in the world. In Peru, Andean cultures built pyramidal structures in places like Caral and Chavín de Huantar during the same era as the early Egyptians.

Other unique pyramidal structures appear in different parts of the world. In Nigeria, the Igbo people built ten clay or mud pyramids in the town of Nsude. These circular stacks served as temples for the god Ala. In Spain, the Pyramids of Güímar on Tenerife consist of six rectangular, terraced structures. These were built from lava without using mortar and were dated to the 19th century. In Europe, the Pyramid of Cestius in Rome was built by the end of the 1st century BC. It stands 27 metres high and remains a notable survivor of the Roman era.

Pyramids connect to many different fields of study today. Archaeologists use them to understand ancient religious practices and social hierarchies. In Greece, researchers have debated the dating of pyramid-like structures at Hellenikon. Some scholars used pottery shards to date these limestone buildings to the 5th or 4th centuries. This has led to academic discussions regarding the relationship between Greek and Egyptian civilizations. Whether used as tombs, temples, or agricultural byproducts, the pyramid remains one of the most significant architectural forms in human history.