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These three massive Egyptian stone structures served as royal tombs and are the only surviving wonder of the original seven.
Difficulty: EasyThis French cathedral, begun in 1163 and famous for its twin towers and rose windows, nearly collapsed before a 19th-century restoration inspired by a novel.
Difficulty: MediumFrom Architectural Secrets of Cathedrals and Churches Trivia →
This Italian engineer developed the mushroom column system for flat-slab concrete construction without drop panels or capitals.
Difficulty: HardThis iron lattice tower in Paris was built for the 1889 World's Fair and stands 1,083 feet tall.
Difficulty: EasyThis London pickle-shaped tower, nicknamed after its shape, uses a diagrid structure that reduces wind loads by 25%.
Difficulty: MediumKing Nebuchadnezzar II allegedly built this lush, tiered wonder in Babylon, though archaeologists have never found definitive proof of its existence.
Difficulty: MediumThis proportional system, based on ad quadratum (rotating squares) and ad triangulum (equilateral triangles), governed the design of many medieval cathedrals including Milan.
Difficulty: HardFrom Architectural Secrets of Cathedrals and Churches Trivia →
This pointed arch style dominated European cathedral construction from the 12th to 16th centuries, featuring flying buttresses and ribbed vaults.
Difficulty: Easy