Temple of Hephaestus stands 2,500 years later -- Aqueducts brought water to ancient Rome -- Hagia Sophia architects turned squares into circles -- Japanese pagodas shimmy and sway during earthquakes -- Anasazi Indians built houses in cliff edges -- La Sagrada Familia celebrates century of construction -- Futuristic Dymaxion House was efficient and affordable -- Gateway Arch is tallest in the world -- Centre Pompidou brings inside outside -- Akashi Kaikyo suspension bridge is built for disaster -- Beijing National Stadium looks like steel bird's nest -- Burj Khalifa breaks skyscraper records.