Pyramid - a structure whose outer surface is triangular and converges to a single point at the top, making the shape geometrically similar to a pyramid. The bottom edge of a pyramid can be a triangle, a quadrilateral, or any polygon. In this way, the pyramid has at least three outer triangular surfaces (at least four including the underside). A common version is a square pyramid with a square base and four triangular outer surfaces.

The pyramid is designed so that most of the weight is close to the ground and the pyramid is at the top, which means that the higher material above the pyramid will be pushed down from the top. This weight distribution enabled early civilizations to build stable monuments.

Civilizations in many parts of the world have built pyramids. By volume, the largest pyramid is the jorula pyramid in Puebla, Mexico. For thousands of years, the largest building on earth was the pyramid - first the Red Pyramid of the Dashur cemetery, then the Great Pyramid of Khufu in Egypt - the only pyramid left in the seven wonders of the ancient world.

The pyramid is mainly constructed of limestone (large red granite blocks are used in some interior rooms), weighing more than 25000 tons (5500 pounds) to 15 tons (33000 pounds), weighing more than 2000000 pieces, and built on a square base with edges of about 230 m (755 ft), covering an area of 13 acres. Its four sides face four basic points, and the angle is 52 degrees. The original height of the pyramid was 146.5 m (488 ft), but today it is only 137 m (455 ft) high, and the stone was lost due to the theft of 9 t (33 ft) of high-quality white tura limestone cover or casing, which was built in Cairo. It is still the highest pyramid.

The earliest known Egyptian pyramid is located in Saqqara, northwest of Memphis. The earliest of these is the Dussel pyramid built by the Third Dynasty (2630-2611 BC). The pyramid and its surrounding complex were designed by architect Imhotep and are generally considered to be the world's oldest stone monumental building.

The most famous pyramids in Egypt are those found in Giza, a suburb of Cairo. Several of the pyramids in Giza are believed to be the largest ever. The pyramid of Khufu in Giza is the largest in Egypt. It is still one of the seven wonders of the ancient world.