Bridges are incredible feats of architecture and engineering, and many have also played host to some of the world’s most pivotal historical events. Here are, five fascinating numerical facts behind some of the planet’s most interesting bridges.
6 million: Number of hand-driven rivets that hold the bridge together, the largest of which weighs a whopping eight pounds. The rivets were heated to red-hot and then individually driven into the bridge’s plates, and the last rivet was installed in 1932, the same year that the bridge was officially opened.
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Golden Gate Bridge
San Francisco, California, United States of America
7,659: Length, in feet, of each of the famous suspension bridge’s main cables. Each cable is more than three feet in diameter, anddiameter and contains 27,572 parallel wires — they are the largest cables ever spun.
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Prague, Czech Republic
30: Number of statues that line the bridge. The statues were originally placed in the 18th century, and depict saints and other religious figures. However, all of the original statues have been replaced by replicas; the originals can be seen in Prague’s National Museum.
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Sarajevo, Bosnia and Herzegovina
1914: Year in which Archduke Franz Ferdinand was assassinated on the Latin Bridge, kickstarting the events that would lead to the beginning of the First World War.
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56: Estimated number of people who can cross the Keshwa Chaca, the last remaining Inca grass bridge in Peru, at one time. The bridge, which is suspended 60 feet above the Apurimac River in the Peruvian Andes, has been in the same location for an estimated 500 years, but because it is constructed from woven grass, it must be rebuilt every year.
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