In which country are the Great Pyramids of Giza?
AnswerEgypt
The Great Pyramids stand on the Giza plateau near Cairo, Egypt.
Challenge · Facts & stats
Build facts & stats
8 fact-checked facts about building and construction, each with the reason behind it. 4 more are in today's round and join this page after it closes.
The basics
Which tool shows whether a surface is perfectly horizontal?
AnswerA spirit level
A spirit level uses an air bubble in liquid to show when a surface is level.
Going deeper
What is the wedge-shaped stone at the top center of an arch called?
AnswerThe keystone
The keystone locks the other stones of an arch in place.
What volcanic ingredient helped make ancient Roman concrete so durable?
AnswerVolcanic ash
Romans mixed lime with volcanic ash (pozzolana), creating concrete that has lasted for millennia.
The Eiffel Tower is built mainly from which material?
AnswerWrought iron
The Eiffel Tower, completed in 1889, is made of wrought iron.
What is a load-bearing wall?
AnswerA wall that supports the weight of the structure above it
Removing a load-bearing wall without other support could weaken a building.
Expert level
Why are triangles used in trusses for bridges and roofs?
AnswerA triangle cannot change shape without changing a side's length
A triangle is rigid, so triangulated frames resist deforming under load.
For which pharaoh was the Great Pyramid of Giza built?
AnswerKhufu
The Great Pyramid was built for the Fourth Dynasty pharaoh Khufu, also called Cheops.
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