Title: History of the world's tallest buildings
Content:  The earliest structures now known to be the tallest in the world were the Egyptian pyramids, with the Great Pyramid of Giza, at an original height of 146.5 m, being the tallest structure in the world for over 3,800 years, until the construction of Lincoln Cathedral in 1311. From then until the completion of the Washington Monument (capped in 1884) the world's tallest buildings were churches or cathedrals. Later, the Eiffel Tower and, still later, some radio masts and television towers were the world's tallest structures. However, though all of these are structures, some are not buildings in the sense of being regularly inhabited or occupied. It is in this sense of being regularly inhabited or occupied that the term "building" 
Title: List of tallest structures by country
Content: El-Mahalla El-Kubra TV Mast, 323 m ; Suez Canal overhead line crossing, 221 m ; Cairo Tower, 187 m ; Great Pyramid of Giza, built c. 2570 BC, tallest structure until c. 1300, originally 146.5 m, currently 138.75 m ; Red Pyramid of Sneferu, built c. 2600 BC, world's tallest structure until 2570 BC, 105 m 
Title: History of the world's tallest buildings
Content:  101 was the next building to hold the record, beginning in 2004. Before the modern skyscraper era, many Christian churches and cathedrals, built mainly in England and Germanic territories between c. undefined 1250–1894, comprised the tallest buildings in the world. Before the 13th century, the tallest buildings in the world cannot be conclusively determined. For instance, the Lighthouse of Alexandria (completed about 280 BC) has been estimated to be 100 m tall, but its true height is not known. For thousands of years, the Great Pyramid in Egypt was the tallest structure in the world, but the Great Pyramid is not considered a building since it is not habitable. Similarly, the Eiffel Tower was the world's tallest structure from 1889, when it was built, until 1930, when the Chrysler Building was built.
Title: List of tallest buildings and structures
Content:  The following is a list of structures that have held the title as the tallest freestanding structure on land. Notable mentions include the Pharos (lighthouse) of Alexandria, built in the third century BC and estimated between 115 –. It was the world's tallest non-pyramidal structure for many centuries. Another notable mention includes the Jetavanaramaya stupa in Anuradhapura, Sri Lanka, which was built in the third century, and was similarly tall at 122 m. These were both the world's tallest or second-tallest non-pyramidal structure for over a thousand years. The tallest secular building between the collapse of the Pharos and the erection of the Washington Monument may have been the Torre del Mangia in Siena, which is 102 m tall, and was constructed in the first half of the fourteenth century, and the 97 m Torre degli Asinelli in Bologna, also Italy, built between 1109 and 1119.
Title: List of tallest pyramids
Content:  This article is a list of the tallest pyramids in the world, both ancient and modern. In order to qualify for inclusion, each entry must be referred to as a "pyramid" (not just "pyramidal", "pyramid-shaped", or "in the shape of a pyramid") by reliable sources and be at least 50 m tall.
Title: Skyscraper
Content:  taller than 600 m. The tallest structure in ancient times was the 146 m Great Pyramid of Giza in ancient Egypt, built in the 26th century BC. It was not surpassed in height for thousands of years, the 160 m Lincoln Cathedral having exceeded it in 1311–1549, before its central spire collapsed. The latter in turn was not surpassed until the 555 ft Washington Monument in 1884. However, being uninhabited, none of these structures actually comply with the modern definition of a skyscraper. High-rise apartments flourished in classical antiquity. Ancient Roman insulae in imperial cities reached 10 and more storeys. Beginning with Augustus (r. 30 BC-14 AD), several emperors attempted to 
Title: History of construction
Content:  The pyramids are chiefly impressive for their enormous size and the staggering manpower that must have been employed in their construction. The largest is the Great Pyramid of Giza which remained the tallest structure in the world for 3800 years (see List of tallest freestanding structures in the world). The engineering problems involved were chiefly to do with the transport of blocks, sometimes over long distances, their movement into location and exact alignment. It is now generally agreed that the skilled building workers were respected and well treated, but undoubtedly very large numbers of labourers were necessary to provide the brute force. The methods used in the construction of the pyramids have been the subject of considerable research and discussion (see: Egyptian pyramid construction techniques).
Title: Egyptian pyramids
Content:   The Egyptian pyramids are ancient masonry structures located in Egypt. Sources cite at least 118 identified Egyptian pyramids. Most were built as tombs for the country's pharaohs and their consorts during the Old and Middle Kingdom periods. The earliest known Egyptian pyramids are found at Saqqara, northwest of Memphis, although at least one step-pyramid-like structure has been found at Saqqara, dating to the First Dynasty: Mastaba 3808, which has been attributed to the reign of Pharaoh Anedjib, with inscriptions, and other archaeological remains of the period, suggesting there may have been others. The otherwise earliest among these is the Pyramid of Djoser built c. undefined during the Third Dynasty. This pyramid and its surrounding complex are generally considered to be the world's oldest monumental structures constructed of dressed masonry. The most famous Egyptian pyramids are those found at Giza, on the outskirts of Cairo. Several of the Giza pyramids are counted among the largest structures ever built. The Pyramid of Khufu is the largest Egyptian pyramid. It is the only one of the Seven Wonders of the Ancient World still in existence; this is despite being the oldest wonder by about 2,000 years.
Title: List of tallest structures in Africa
Content:  This list of tallest structures in Africa ranks man-made structures in Africa that stand at least 150 m tall, based on standard height measurement. List is containing only completed structures, including demolished or destroyed structures. For comparison the Great Pyramid of Giza in Egypt is currently 138.8 m tall and was estimated to have been 146.6 m tall when constructed.
Title: List of tallest buildings
Content:  Historically, the world's tallest man-made structure was the Great Pyramid of Giza in Egypt, which held the position for over 3,800 years until the construction of Lincoln Cathedral in 1311. The Strasbourg Cathedral in France, completed in 1439, was the world's tallest building until 1874. The first skyscraper was pioneered in Chicago with the 138 ft Home Insurance Building in 1885. The United States would hold the position of the world's tallest building throughout the 20th century until 1998, when the Petronas Towers were completed. Since then, two other buildings have gained the title: Taipei 101 in 2004 and Burj Khalifa in 2010. Since the beginning of the 21st century, the Middle East, China, and Southeast Asia have experienced booms in skyscraper construction.

Question: how long were the pyramids the tallest structure?
Answer: over 3,800.
over 3,800 years.