NOVA Online (click here for NOVA home)
Secrets of Lost Empires

Bridge the Gap

Click and drag each bridge to the correct location (if you need to, survey the sites again):

Photos: (1) NOVA/WGBH; (2) Rita Serderian-Precast/Prestressed Concrete Institute; (3) Portland Cement Association; (4) The Honshu-Shikoku Bridge Authority.

NOVA Builds a Rainbow Bridge | Bridge the Gap | Nature's Miracle Material
China's Age of Invention | Resources | Transcript

Medieval Siege | Pharaoh's Obelisk | Easter Island | Roman Bath | China Bridge | Site Map

Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule
About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print
PBS Online | NOVA Online | WGBH

© | Updated November 2000

Support provided by

For new content
visit the redesigned
NOVA site