SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Roman road. This road runs through Ostia Antica, an ancient Roman seaport built at the mouth of the Tiber River near Rome, Italy. The port was founded by the Roman king Ancus Marcius in about 620 BC and was used to import grain and other essentials for the city of Rome. Roman roads generally contained four layers. The top layer was usually cemented flag stone, below which were various levels of sand, gravel and aggregate. Roman roads are characteristically straight, as seen here. These roads are still intact today and can be found from Scotland to Iraq.
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