Built and invented
Engineering
Bridges, towers, dams and monuments: how they were designed and built, and the materials and measurements behind them.
Fact files
All topics ›The Eiffel Tower
18,038 parts
Metal parts in the structure
Hoover Dam
726.4 feet
Height from foundation rock to the crest roadway
The Statue of Liberty
2.4 millimetres
Thickness of the copper skin
The Brooklyn Bridge
1,595.5 feet
Length of the main span
The Leaning Tower of Pisa
9 August 1173
Date the foundation stones were laid
The Golden Gate Bridge
1,280 metres
Main span, longest in the world from 1937 to 1964
