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Roman bridge
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<p>The <a href="/facts/Ancient_Romans/cGqIuxPd">ancient Romans</a> were the first civilization to build large, permanent <a href="/facts/Bridges/vBJ7Hw8v">bridges</a>. Early Roman bridges used techniques introduced by <a href="/facts/Etruscan_civilization/yw3dmLgd">Etruscan</a> <a href="/facts/Immigrants/8vNxfBhT">immigrants</a>, but the Romans improved those skills, developing and enhancing methods such as <a href="/facts/Arch/t9L51pqn">arches</a> and <a href="/facts/Keystones/MSgwfvsa">keystones</a>. There were three major types of Roman bridge: wooden, pontoon, and stone. Early Roman bridges were wooden, but by the 2nd century BC stone was being used. Stone bridges used the arch as their <a href="/facts/Arch_bridge/oGQeFjp2">basic structure</a>, and most used <a href="/facts/Roman_concrete/4fUqugB5">concrete</a>, the first use of this material in bridge-building. </p>