Beginning in the 4th century B.C., Romans constructed huge

aquaducts to carry water for distances up to 50 miles.

These structures were built on continuous gradual declines to

transport water by force of gravity. Each arch

spanned 82 feet.

RomanThe Colosseum

A.D.70-82Rome, Italy

Originally called The Flavian Amphitheater after the Roman

Emperor Flavius

The Colosseum seated 50,000 spectators.

It was so efficiently laid out that it inspired

present day stadium design.

RomanThe PantheonA.D.118-125

Rome