Celtic Museum Manching ( Bavaria ). Modell of the ancient Roman bridge ( 165 AD ) at Stepperg - Construction of the bridge: Transport ship with stones.
<a href="//commons.wikimedia.org/wiki/User:Xenophon" title="User:Xenophon">Wolfgang Sauber</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>