Did you know?... The oldest existing arch bridge is
found in Greece and dates back to 1300 BC. The Romans were the first to
made arch bridges from concrete. Arch bridges today are constructed of
steel and reinforced concrete.
The Chaotianmen Bridge is the world's largest steel bridge.
It is located in the city of Chonqing,
China. It has a span of 552 mitres.
How To Download Pictures
To save clipart to your hard drive, right click on
a graphic, and then
choose "save as" and select a location on your computer.
Look for the "Did You
Know" section at the bottom of each page.