The Great Pyramid was the world's tallest man-made structure for 3,871 years — from 2560 BC until Lincoln Cathedral was completed in 1311 AD. It is built from 2.3 million stone blocks, each weighing 2.5 to 15 tons, transported from quarries 800 kilometres away. The four sides are aligned to true north with an accuracy of 0.05 degrees — a precision unmatched until the development of satellite surveying. The pyramid's base is level to within 2.1 centimetres across its entire 230-metre perimeter.

The Sphinx was completely buried in sand up to its neck for much of its existence. In the 14th century BC, Prince Thutmose fell asleep between its paws and dreamed the Sphinx promised him the throne if he cleared the sand — he later became Pharaoh Thutmose IV. The Sphinx was only fully excavated between 1925 and 1936, after having spent over 2,000 years periodically disappearing beneath the desert. Its nose is famously missing — contrary to the popular myth of Napoleon's cannons, the nose was removed long before, likely by a Sufi iconoclast in the 14th century.

The Egyptian Museum houses 120,000 artefacts, but only about 50,000 are on display at any time — the rest sit in basement storage. The Tutankhamun collection alone fills an entire wing with 5,398 objects, including his solid gold death mask weighing 11 kilograms. The museum was so overcrowded that the Grand Egyptian Museum near Giza was built to relieve it — a project that began in 2002 and remained incomplete for over 20 years, during which time the old museum continued operating with objects stacked two-deep in cabinets.

The mosque is clad in 40,000 alabaster panels imported from the Beni Suef region, giving it its popular name and a warm honey-coloured glow. Muhammad Ali deliberately chose the highest point of Cairo's Citadel for the mosque, making its twin 82-metre minarets visible from across the city. The alabaster has weathered significantly since 1848 — the panels were originally translucent white, not honey-coloured, and the discolouration cannot be reversed without replacing all 40,000 panels.

Khan el-Khalili is one of the oldest continuously operating markets in the world — it has been trading without interruption since 1382. The legendary El Fishawy coffeeshop in the market has been open for over 250 years without ever closing its doors. Naguib Mahfouz, Egypt's Nobel laureate in literature, set his most famous novel (Midaq Alley) in this very market. The market was originally a caravanserai for traders arriving from across the Islamic world, and today still serves as a crossroads of cultures.

The mosque's entrance portal rises 38 metres — the tallest of any medieval structure in Cairo. Construction was so ambitious that one of the four minarets collapsed during building, killing 300 people. Napoleon's soldiers, who used the mosque as a barracks during the French campaign, named it the "Mamluk Pantheon." Most remarkably, some of the mosque's stones were quarried from the Great Pyramid of Giza itself — pyramid stones that had stood for 3,800 years were recycled into a medieval mosque.

Al-Azhar University is the oldest continuously operating degree-granting university in the world — it has been teaching students since 972 AD, over 1,050 continuous years. It has 65 branches worldwide and is widely regarded as the highest authority in Sunni Islamic theology. The traditional teaching method — students sitting in a circle at the feet of their sheikh (halqa) — has remained unchanged since the 10th century. Al-Azhar has outlived the Fatimid, Ayyubid, Mamluk, Ottoman, and British empires, all of which ruled Egypt at different times.

The Hanging Church is named for its nave suspended over a Roman fortress gate — built directly on top of the Babylon Fortress, an ancient Roman stronghold dating to the 1st century BC. The church floor sits 15 metres below present-day street level, meaning Cairo has risen 15 metres in 17 centuries of accumulated debris, dust, and construction. Walking into the church is walking down into a city that has buried its own past, with the Roman, Coptic, and Islamic eras all stacked vertically.