Egypt

The ankh or key of life is an ancient Egyptian hieroglyphic symbol that was most commonly used in writing and in Egyptian art to represent the word for 'life' and, by extension, as a symbol of life itself. The ankh has a cross shape but with a teardrop-shaped loop in place of an upper bar. The origins of the symbol are not known, although many hypotheses have been proposed. It was used in writing as a triliteral sign, representing a sequence of three consonants, Ꜥ-n-ḫ. This sequence was found in several Egyptian words, including the words meaning 'mirror', 'floral bouquet', and 'life'. In art the symbol often appeared as a physical object representing either life or substances such as air or water that are related to it. It was especially commonly held in the hands of ancient Egyptian deities, or being given by them to the pharaoh, to represent their power to sustain life and to revive human souls in the afterlife. The ankh was one of the most common decorative motifs in ancient Egypt and was also used decoratively by neighbouring cultures. Coptic Christians adapted it into the crux ansata, a shape with a circular rather than oval loop, and used it as a variant of the Christian cross. Since the late 20th century, in the Western world, the ankh has again come to be used decoratively, as a symbol of African cultural identity, Neopagan belief systems, and the goth subculture.

An obelisk is a tall, four-sided, narrow tapering monument which ends in a pyramid-like shape or pyramidion at the top. Originally they were called tekhenu by their builders, the Ancient Egyptians. The Greeks who saw them used the Greek term obeliskos to describe them, and this word passed into Latin and ultimately English. Ancient obelisks are monolithic; that is, they consist of a single stone. Most modern obelisks are made of several stones. Obelisks were prominent in the architecture of the ancient Egyptians, and played a vital role in their religion placing them in pairs at the entrance of the temples. The word 'obelisk' as used in English today is of Greek rather than Egyptian origin because Herodotus, the Greek traveller, was one of the first classical writers to describe the objects. A number of ancient Egyptian obelisks are known to have survived, plus the 'Unfinished Obelisk' found partly hewn from its quarry at Aswan. These obelisks are now dispersed around the world, and fewer than half of them remain in Egypt. The earliest temple obelisk still in its original position is the 68-foot (20.7 m) 120-metric-ton (130-short-ton) red granite Obelisk of Senusret I of the Twelfth Dynasty at Al-Matariyyah in modern Heliopolis. The obelisk symbolized the sun god Ra, and during the religious reformation of Akhenaten it was said to have been a petrified ray of the Aten, the sundisk. Benben was the mound that arose from the primordial waters Nu upon which the creator god Atum settled in the creation story of the Heliopolitan creation myth form of Ancient Egyptian religion. The Benben stone (also known as a pyramidion) is the top stone of the Egyptian pyramid. It is also related to the obelisk. It is hypothesized by New York University Egyptologist Patricia Blackwell Gary and Astronomy senior editor Richard Talcott that the shapes of the ancient Egyptian pyramid and obelisk were derived from natural phenomena associated with the sun (the sun-god Ra being the Egyptians' greatest deity). The pyramid and obelisk's significance have been previously overlooked, especially the astronomical phenomena connected with sunrise and sunset: the zodiacal light and sun pillars respectively.

Islamic Cairo , also called Historic Cairo or Medieval Cairo, refers generically to the historic areas of Cairo, Egypt, that existed before the city's modern expansion during the 19th and 20th centuries; particularly the central parts around the old walled city and around the Citadel of Cairo. The name 'Islamic' Cairo refers not to a greater prominence of Muslims in the area but rather to the city's rich history and heritage since its foundation in the early period of Islam, while distinguishing it from with the nearby Ancient Egyptian sites of Giza and Memphis. This area holds one of the largest and densest concentrations of historic architecture in the Islamic world. It is characterized by hundreds of mosques, tombs, madrasas, mansions, caravanserais, and fortifications dating from throughout the Islamic era of Egypt. In 1979, the United Nations Educational, Scientific and Cultural Organization (UNESCO) proclaimed Historic Cairo a World Cultural Heritage site, as 'one of the world's oldest Islamic cities, with its famous mosques, madrasas, hammams and fountains' and 'the new centre of the Islamic world, reaching its golden age in the 14th century.'

The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza pyramid complex bordering present-day Giza in Greater Cairo, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact. Egyptologists believe that the pyramid was built as a tomb for the Fourth Dynasty Egyptian pharaoh Khufu over a 20-year period concluding around 2560 BC. Initially standing at 146.5 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years. It is estimated to weigh approximately 6 million tonnes, and consists of 2.3 million blocks of limestone and granite, some weighing as much as 80 tonnes. It was originally covered by limestone casing stones that formed a smooth outer surface; what is seen today is the underlying core structure, although a few casing stones can still be seen at the base. It was built by extracting huge stones from a quarry and lifting them into place, but there are varying scientific and alternative theories about the exact construction technique. There are three known chambers inside the Great Pyramid. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished. The so-called Queen's Chamber and King's Chamber are higher up within the pyramid structure. The main part of the Giza complex is a set of buildings that included two mortuary temples in honour of Khufu (one close to the pyramid and one near the Nile), three smaller pyramids for Khufu's wives, an even smaller 'satellite' pyramid, a raised causeway connecting the two temples, and small mastaba tombs for nobles surrounding the pyramid.