Major cities like Antioch, Ancyra (modern-day Ankara) and Byzantium in what is now Turkey, as well as Corinth in Greece, were "better located than Rome" for those traveling by land, the team wrote in a paper published Tuesday (Sept. 15) in the journal Nature Communications.
At its height in A.D. 117, the Roman Empire covered almost 2.1 million square miles (5.5 million square kilometers) around the Mediterranean Sea, occupying much of Europe, the Middle East and North Africa, the team noted in the study.
For years, the scientists have been creating a vast digital atlas called "Itiner-e" of nearly 186,000 miles (300,000 kilometers) of Roman roads. For the new study, they calculated how well Roman cities were connected to the road system.
In fact, the empire's "most important intermediary route" by land identified in the study didn't even run through Rome.
The ancient streets of Ostia, the seaport of Rome at the mouth of the Tiber River, are still visible today. (Image credit: Tom Brughmans)"It follows the North African and Levantine coast past Antioch and near Ankara, crosses over to Europe at Constantinople, and moves through the Po Valley and Milan into France," study co-author Tom Brughmans, a professor of classical archaeology at Aarhus University in Denmark, told Live Science in an email.
The other well-connected cities had a bevy of reasons for their numerous roads. For instance, Corinth was better connected to the road network because the roads that ran through it linked the Greek Peloponnesian Peninsula to the rest of Greece, and Ancyra was better connected because it was a vital transportation hub for Anatolia.
The Arch of Drusus in Rome is near the beginning of the Via Appia, an ancient and famous Roman road that is still in use today. (Image credit: Tom Brughmans)Rome's unique location is likely the biggest reason why it wasn’t as well connected to the road system as these other cities.
Brughmans noted that the "Italian Peninsula is an appendix to the empire's road network, and Rome is halfway down this appendix." And when "we consider all movement within the entire Italian Peninsula, we were shocked to discover that the most central road actually follows the opposite Adriatic coastline, bypassing Rome altogether," Brughmans added.
The study also found that when the shape of the land allowed it, Roman roads tended to be straight, but they were not as straight as modern-day roads.
Today, "modern road building avoids sharp turns and aims to build as straight roads as possible by strongly modifying the terrain to facilitate faster travel by car, which is made possible by modern surveying and construction methods," the team wrote in their paper.
Sea and river connections
Although the new research sheds light on road connections, it's important to remember that road travel wasn't the only means of transport in the Roman Empire. In fact, the researchers noted that Rome may have had a more significant position for sea and river transportation than it had for road transportation.
Passersby can still walk on the city streets of the ancient port city Ostia. (Image credit: Tom Brughmans)Although the study didn't look at waterways, Rome's central location in the empire meant that it would have been an important hub of water transport, the team wrote in the study.
"Rome's central location is not due to its roads, but its physical location in the centre of the Mediterranean, on the nexus of major shipping lanes," Brughmans explained.
The team said future studies should examine sea and river transport and integrate their findings with the team's Roman roads study. When considered together, road and waterway routes may help researchers better understand Roman transportation networks.
Pažout, A. et al. (2026). Network science reveals the structure and lasting impact of the Roman road system. Nature Communications, 17(9551). https://doi.org/10.1038/s41467-026-75453-3
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'> Did 'all roads lead to Rome'? New study finds other cities in the empire were better connected. The discovery, made at the La Tejería site near the small village of El Castellar in eastern Spain, provides some of the strongest fossil evidence yet that dinosaurs could move between North America and Europe during the Late Jurassic, when the Atlantic Ocean was still in its early stages of opening after the breakup of the supercontinent Pangaea. The researchers published their findings Tuesday (Sept. 15) in the Journal of Vertebrate Paleontology.
"Paleontological studies like this one help us better understand the history of life on Earth, reconstruct ancient ecosystems, and understand how they changed through time," study first author Sergio Sánchez Fenollosa, a doctoral student who studies biodiversity and evolutionary biology at the Joint Paleontology Foundation Teruel-Dinópolis (Dinópolis Foundation), a paleontological research institution, told Live Science via email.
A sauropod in Spain
Dippy is one of the best-known dinosaurs. After its fossils made their grand debut at the Carnegie Museum of Natural History in Pittsburgh in the early 1900s, life-size fossil replicas of the towering herbivore were sent around the world, including to England, France, Spain, Argentina and Russia.
But until now, Diplodocus' Late Jurassic fossils were known only from the Morrison Formation in the western United States — and the latest discovery shows that Dippy wasn't a homebody.
The newly unearthed Diplodocus specimen consists of 14 well-preserved tail vertebrae and several chevrons — bones that helped support blood vessels and muscles within the dinosaur's tail.
Study co-author and managing director of the Dinópolis Foundation, Alberto Cobos, said it was a friend who "thought he had spotted some bones on a mountainside," Cobos told Live Science via email. "That very day, I went to the site near El Castellar (a village in the province of Teruel). Sure enough, we saw a couple of sauropod vertebral centers."
Although only part of the skeleton has been recovered, the bones show a series of characteristics associated with Diplodocus, including large cavities corresponding to where air sacs would have been, along with deep grooves running alongside the underside of the tailbones.
The 14 vertebrate and several chevrons found in Spain correspond to the Dipolodocus' anatomy. (Image credit: Carmelo López)"It was an exciting and continuous process of seeing the pieces of the puzzle gradually fall into place," Sánchez Fenollosa said in a statement. "From the early stages of the osteological study, we noticed strong similarities with several diplodocine sauropods … With each new result, the picture became clearer: we were looking at a Diplodocus."
It's unclear which species of Diplodocus the new specimen is, but like others of its genus, it was a huge dinosaur with an extremely long neck and whip-like tail.
"The Diplodocus from El Castellar was approximately 25 meters [82 feet] long (comparable in size to its North American relatives), making it another of the giant sauropods of the Spanish Jurassic," Cobos said in the statement.
An ancient bridge
Between 195 million and 170 million years ago, the supercontinent Pangaea broke apart as the Atlantic Ocean opened. But the ocean was much narrower than it is today, and the continents were not necessarily as isolated as their modern geography is now.
Evidence indicates that temporary land bridges may have allowed some animals to move between the two regions. The most famous prehistoric land bridge is the Bering Land Bridge that humans used to move between Asia and what is now Alaska. Previous research showed the Bering Land Bridge also existed around 68 million years ago, and it may have allowed an Asian ancestor of Tyrannosaurus rex to trek into North America.
One possible route for Diplodocus into Spain may have been a land bridge that connected what is now Newfoundland with the Iberian Peninsula.
Geological conditions may have allowed dinosaurs like Diplodocus to move between continents, Sánchez Fenollosa told Live Science in an email. "This interpretation is supported not only by the fossil record but also by geological evidence," he said.
The newfound Diplodocus fossils also suggest that the distribution of giant sauropods was more complicated than the fossil record previously indicated.
"More complete specimens will be essential to understand this story in greater detail, particularly to determine which Diplodocus species inhabited Europe: whether it was one already known from North America or a previously unknown species," Sánchez Fenollosa said. "This discovery reminds us that even for such iconic dinosaurs, there are still many unanswered questions about their evolutionary history and biogeography."
'> Fossils of iconic long-necked dinosaur Diplodocus found in Europe for first time — and it may have traveled there via land bridge '> 'That could push them over the edge': How climate change could fuel impulsive behavior