Come and travel through the history of five popular and interesting bridges.These bridges span the shiny waters of San Francisco Bay to the peaceful cities of Japan.
The first bridge known to historians was an arch bridge. It was built in 2200 B.C. Romans, Greeks, Chinese, and Egyptians built arch bridges. During the middle ages drawbridges were invented. They were built over castle moats in Europe. Most bridges were made out of stone and wood until the 1700s. Then they were made of cast iron and wrought iron. Suspension bridges were first hung from wrought iron chains in the 1800s.
The Tatara will be the worlds longest cable- stayed bridge when it is completed in 1999. This bridge is costing 300,000,000,000 dollars a year to build. The Tatara bridge was originally conceived as a suspension bridge. This bridge is located in Japan. Its span is 2,919 feet.
Mr. Ben Van Berkel was the architecture of this bridge. This is a cable- stayed bridge with a main span of 918 feet. It was completed in 1996. The materials used to build this bridge were steel and concrete.This bridge is located in the Netherlands.
The Mackinac was completed in 1957. It connects the upper and lower peninsula of Michigan.This bridge is right next to Mackinac Island where it got its name. Most people pronounce it Mak-i-nak but the correct way to pronounce it is Mak-i-naw.It is one of the longest suspension bridges in the world.
Santiago Calatrava built this bridge in 1991.The Lusitania connects the old part of Merida,Spain and Poliango,Spain.It is 1,500 feet long with an arch span of 620 feet.The Lusitanias pillars have been criticized for their massive appearance.This is one of Calatravas favorites.
The Golden Gate Bridge is one of the seven wonders of the modern world says the American Society of Civil Engineers. It was first opened in 1937. It is the gateway to San Francisco Bay. It stretches over 4,600 feet! It is one of the longest suspension bridges in the world! Its towers reach 746 feet tall which is as tall as skyscrapers.
All of the 5 bridges are supported with suspension cables. All of these bridges have unique spans and designs.